diff --git a/.eslintrc.json b/.eslintrc.json
index 9acfc3c48..383d25115 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,5 +1,6 @@
 {
-  "extends": "standard",
+  "extends": ["standard", "plugin:jest/recommended"],
+  "plugins": ["jest"],
   "rules": {
     "one-var": "off",
     "semi": ["error", "always"],
diff --git a/index.js b/index.js
index e812b61d3..70c2d1494 100644
--- a/index.js
+++ b/index.js
@@ -87,6 +87,30 @@ Option.prototype.is = function(arg) {
   return this.short === arg || this.long === arg;
 };
 
+/**
+ * CommanderError class
+ * @class
+ */
+class CommanderError extends Error {
+  /**
+   * Constructs the CommanderError class
+   * @param {Number} exitCode suggested exit code which could be used with process.exit
+   * @param {String} code an id string representing the error
+   * @param {String} message human-readable description of the error
+   * @constructor
+   */
+  constructor(exitCode, code, message) {
+    super(message);
+    // properly capture stack trace in Node.js
+    Error.captureStackTrace(this, this.constructor);
+    this.name = this.constructor.name;
+    this.code = code;
+    this.exitCode = exitCode;
+  }
+}
+
+exports.CommanderError = CommanderError;
+
 /**
  * Initialize a new `Command`.
  *
@@ -157,6 +181,8 @@ Command.prototype.command = function(nameAndArgs, actionOptsOrExecDesc, execOpts
   cmd._helpDescription = this._helpDescription;
   cmd._helpShortFlag = this._helpShortFlag;
   cmd._helpLongFlag = this._helpLongFlag;
+  cmd._exitCallback = this._exitCallback;
+
   cmd._executableFile = opts.executableFile; // Custom name for executable file
   this.commands.push(cmd);
   cmd.parseExpectedArgs(args);
@@ -228,6 +254,47 @@ Command.prototype.parseExpectedArgs = function(args) {
   return this;
 };
 
+/**
+ * Register callback `fn` to use as replacement for calling process.exit.
+ *
+ * @param {Function} fn callback which will be passed a CommanderError
+ * @return {Command} for chaining
+ * @api public
+ */
+
+Command.prototype._exitOverride = function(fn) {
+  if (fn) {
+    this._exitCallback = fn;
+  } else {
+    this._exitCallback = function(err) {
+      if (err.code !== 'commander.executeSubCommandAsync') {
+        throw err;
+      } else {
+        // Async callback from spawn events, not useful to throw.
+      }
+    };
+  }
+  return this;
+};
+
+/**
+ * Call process.exit, and _exitCallback if defined.
+ *
+ * @param {Number} exitCode exit code for using with process.exit
+ * @param {String} code an id string representing the error
+ * @param {String} message human-readable description of the error
+ * @return never
+ * @api private
+ */
+
+Command.prototype._exit = function(exitCode, code, message) {
+  if (this._exitCallback) {
+    this._exitCallback(new CommanderError(exitCode, code, message));
+    // Expecting this line is not reached.
+  }
+  process.exit(exitCode);
+};
+
 /**
  * Register callback `fn` for the command.
  *
@@ -586,14 +653,30 @@ Command.prototype.executeSubCommand = function(argv, args, unknown, executableFi
       }
     });
   });
-  proc.on('close', process.exit.bind(process));
+
+  // By default terminate process when spawned process terminates.
+  // Suppressing the exit if exitCallback defined is a bit messy and of limited use, but does allow process to stay running!
+  const exitCallback = this._exitCallback;
+  if (!exitCallback) {
+    proc.on('close', process.exit.bind(process));
+  } else {
+    proc.on('close', () => {
+      exitCallback(new CommanderError(process.exitCode || 0, 'commander.executeSubCommandAsync', '(close)'));
+    });
+  }
   proc.on('error', function(err) {
     if (err.code === 'ENOENT') {
       console.error('error: %s(1) does not exist, try --help', bin);
     } else if (err.code === 'EACCES') {
       console.error('error: %s(1) not executable. try chmod or run with root', bin);
     }
-    process.exit(1);
+    if (!exitCallback) {
+      process.exit(1);
+    } else {
+      const wrappedError = new CommanderError(1, 'commander.executeSubCommandAsync', '(error)');
+      wrappedError.nestedError = err;
+      exitCallback(wrappedError);
+    }
   });
 
   // Store the reference to the child process
@@ -810,8 +893,9 @@ Command.prototype.opts = function() {
  */
 
 Command.prototype.missingArgument = function(name) {
-  console.error("error: missing required argument '%s'", name);
-  process.exit(1);
+  const message = `error: missing required argument '${name}'`;
+  console.error(message);
+  this._exit(1, 'commander.missingArgument', message);
 };
 
 /**
@@ -823,12 +907,14 @@ Command.prototype.missingArgument = function(name) {
  */
 
 Command.prototype.optionMissingArgument = function(option, flag) {
+  let message;
   if (flag) {
-    console.error("error: option '%s' argument missing, got '%s'", option.flags, flag);
+    message = `error: option '${option.flags}' argument missing, got '${flag}'`;
   } else {
-    console.error("error: option '%s' argument missing", option.flags);
+    message = `error: option '${option.flags}' argument missing`;
   }
-  process.exit(1);
+  console.error(message);
+  this._exit(1, 'commander.optionMissingArgument', message);
 };
 
 /**
@@ -840,8 +926,9 @@ Command.prototype.optionMissingArgument = function(option, flag) {
 
 Command.prototype.unknownOption = function(flag) {
   if (this._allowUnknownOption) return;
-  console.error("error: unknown option '%s'", flag);
-  process.exit(1);
+  const message = `error: unknown option '${flag}'`;
+  console.error(message);
+  this._exit(1, 'commander.unknownOption', message);
 };
 
 /**
@@ -852,8 +939,9 @@ Command.prototype.unknownOption = function(flag) {
  */
 
 Command.prototype.variadicArgNotLast = function(name) {
-  console.error("error: variadic arguments must be last '%s'", name);
-  process.exit(1);
+  const message = `error: variadic arguments must be last '${name}'`;
+  console.error(message);
+  this._exit(1, 'commander.variadicArgNotLast', message);
 };
 
 /**
@@ -881,7 +969,7 @@ Command.prototype.version = function(str, flags, description) {
   this.options.push(versionOption);
   this.on('option:' + this._versionOptionName, function() {
     process.stdout.write(str + '\n');
-    process.exit(0);
+    this._exit(0, 'commander.version', str);
   });
   return this;
 };
@@ -1208,7 +1296,9 @@ Command.prototype.helpOption = function(flags, description) {
 
 Command.prototype.help = function(cb) {
   this.outputHelp(cb);
-  process.exit();
+  // exitCode: preserving original behaviour which was calling process.exit()
+  // message: do not have all displayed text available so only passing placeholder.
+  this._exit(process.exitCode || 0, 'commander.help', '(outputHelp)');
 };
 
 /**
@@ -1253,7 +1343,8 @@ function outputHelpIfNecessary(cmd, options) {
   for (var i = 0; i < options.length; i++) {
     if (options[i] === cmd._helpLongFlag || options[i] === cmd._helpShortFlag) {
       cmd.outputHelp();
-      process.exit(0);
+      // (Do not have all displayed text available so only passing placeholder.)
+      cmd._exit(0, 'commander.helpDisplayed', '(outputHelp)');
     }
   }
 }
diff --git a/package-lock.json b/package-lock.json
index 4e3191949..44e943c93 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,118 @@
         "@babel/highlight": "^7.0.0"
       }
     },
+    "@babel/core": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.5.5.tgz",
+      "integrity": "sha512-i4qoSr2KTtce0DmkuuQBV4AuQgGPUcPXMr9L5MyYAtk06z068lQ10a4O009fe5OB/DfNV+h+qqT7ddNV8UnRjg==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.5.5",
+        "@babel/generator": "^7.5.5",
+        "@babel/helpers": "^7.5.5",
+        "@babel/parser": "^7.5.5",
+        "@babel/template": "^7.4.4",
+        "@babel/traverse": "^7.5.5",
+        "@babel/types": "^7.5.5",
+        "convert-source-map": "^1.1.0",
+        "debug": "^4.1.0",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.13",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+          "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.0.0"
+          }
+        },
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        },
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/generator": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.5.5.tgz",
+      "integrity": "sha512-ETI/4vyTSxTzGnU2c49XHv2zhExkv9JHLTwDAFz85kmcwuShvYG2H08FwgIguQf4JC75CBnXAUM5PqeF4fj0nQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.5.5",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
+      "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.0.0",
+        "@babel/template": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
+      "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-plugin-utils": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz",
+      "integrity": "sha512-CYAOUCARwExnEixLdB6sDm2dIJ/YgEAKDM1MOeMeZu9Ld/bDgVo8aiWrXwcY7OBh+1Ea2uUcVRcxKk0GJvW7QA==",
+      "dev": true
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
+      "integrity": "sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.4.4"
+      }
+    },
+    "@babel/helpers": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.5.5.tgz",
+      "integrity": "sha512-nRq2BUhxZFnfEn/ciJuhklHvFOqjJUD5wpx+1bxUF2axL9C+v4DE/dmp5sT2dKnpOs4orZWzpAZqlCy8QqE/7g==",
+      "dev": true,
+      "requires": {
+        "@babel/template": "^7.4.4",
+        "@babel/traverse": "^7.5.5",
+        "@babel/types": "^7.5.5"
+      }
+    },
     "@babel/highlight": {
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
@@ -24,40 +136,196 @@
         "js-tokens": "^4.0.0"
       }
     },
-    "@sinonjs/commons": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.4.0.tgz",
-      "integrity": "sha512-9jHK3YF/8HtJ9wCAbG+j8cD0i0+ATS9A7gXFqS36TblLPNy6rEEc+SB0imo91eCboGaBYGV/MT1/br/J+EE7Tw==",
+    "@babel/parser": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.5.5.tgz",
+      "integrity": "sha512-E5BN68cqR7dhKan1SfqgPGhQ178bkVKpXTPEXnFJBrEt8/DKRZlybmy+IgYLTeN7tp1R5Ccmbm2rBk17sHYU3g==",
+      "dev": true
+    },
+    "@babel/plugin-syntax-object-rest-spread": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-object-rest-spread/-/plugin-syntax-object-rest-spread-7.2.0.tgz",
+      "integrity": "sha512-t0JKGgqk2We+9may3t0xDdmneaXmyxq0xieYcKHxIsrJO64n1OiMWNUtc5gQK1PA0NpdCRrtZp4z+IUaKugrSA==",
       "dev": true,
       "requires": {
-        "type-detect": "4.0.8"
+        "@babel/helper-plugin-utils": "^7.0.0"
       }
     },
-    "@sinonjs/formatio": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/@sinonjs/formatio/-/formatio-3.2.1.tgz",
-      "integrity": "sha512-tsHvOB24rvyvV2+zKMmPkZ7dXX6LSLKZ7aOtXY6Edklp0uRcgGpOsQTTGTcWViFyx4uhWc6GV8QdnALbIbIdeQ==",
+    "@babel/template": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
+      "integrity": "sha512-CiGzLN9KgAvgZsnivND7rkA+AeJ9JB0ciPOD4U59GKbQP2iQl+olF1l76kJOupqidozfZ32ghwBEJDhnk9MEcw==",
       "dev": true,
       "requires": {
-        "@sinonjs/commons": "^1",
-        "@sinonjs/samsam": "^3.1.0"
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.4.4",
+        "@babel/types": "^7.4.4"
       }
     },
-    "@sinonjs/samsam": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.2.tgz",
-      "integrity": "sha512-ILO/rR8LfAb60Y1Yfp9vxfYAASK43NFC2mLzpvLUbCQY/Qu8YwReboseu8aheCEkyElZF2L2T9mHcR2bgdvZyA==",
+    "@babel/traverse": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.5.5.tgz",
+      "integrity": "sha512-MqB0782whsfffYfSjH4TM+LMjrJnhCNEDMDIjeTpl+ASaUvxcjoiVCo/sM1GhS1pHOXYfWVCYneLjMckuUxDaQ==",
       "dev": true,
       "requires": {
-        "@sinonjs/commons": "^1.0.2",
-        "array-from": "^2.1.1",
-        "lodash": "^4.17.11"
+        "@babel/code-frame": "^7.5.5",
+        "@babel/generator": "^7.5.5",
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/helper-split-export-declaration": "^7.4.4",
+        "@babel/parser": "^7.5.5",
+        "@babel/types": "^7.5.5",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.13"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+          "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.0.0"
+          }
+        }
+      }
+    },
+    "@babel/types": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.5.5.tgz",
+      "integrity": "sha512-s63F9nJioLqOlW3UkyMd+BYhXt44YuaFm/VV0VwuteqjYwRrObkU7ra9pY4wAJR3oXi8hJrMcrcJdO/HH33vtw==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2",
+        "lodash": "^4.17.13",
+        "to-fast-properties": "^2.0.0"
+      }
+    },
+    "@cnakazawa/watch": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@cnakazawa/watch/-/watch-1.0.3.tgz",
+      "integrity": "sha512-r5160ogAvGyHsal38Kux7YYtodEKOj89RGb28ht1jh3SJb08VwRwAKKJL0bGb04Zd/3r9FL3BFIc3bBidYffCA==",
+      "dev": true,
+      "requires": {
+        "exec-sh": "^0.3.2",
+        "minimist": "^1.2.0"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        }
+      }
+    },
+    "@jest/console": {
+      "version": "24.7.1",
+      "resolved": "https://registry.npmjs.org/@jest/console/-/console-24.7.1.tgz",
+      "integrity": "sha512-iNhtIy2M8bXlAOULWVTUxmnelTLFneTNEkHCgPmgd+zNwy9zVddJ6oS5rZ9iwoscNdT5mMwUd0C51v/fSlzItg==",
+      "dev": true,
+      "requires": {
+        "@jest/source-map": "^24.3.0",
+        "chalk": "^2.0.1",
+        "slash": "^2.0.0"
+      }
+    },
+    "@jest/source-map": {
+      "version": "24.3.0",
+      "resolved": "https://registry.npmjs.org/@jest/source-map/-/source-map-24.3.0.tgz",
+      "integrity": "sha512-zALZt1t2ou8le/crCeeiRYzvdnTzaIlpOWaet45lNSqNJUnXbppUUFR4ZUAlzgDmKee4Q5P/tKXypI1RiHwgag==",
+      "dev": true,
+      "requires": {
+        "callsites": "^3.0.0",
+        "graceful-fs": "^4.1.15",
+        "source-map": "^0.6.0"
+      }
+    },
+    "@types/babel__core": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.1.2.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/parser": "^7.1.0",
+        "@babel/types": "^7.0.0",
+        "@types/babel__generator": "*",
+        "@types/babel__template": "*",
+        "@types/babel__traverse": "*"
+      }
+    },
+    "@types/babel__generator": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/@types/babel__generator/-/babel__generator-7.0.2.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@types/babel__template": {
+      "version": "7.0.2",
+      "resolved": "https://registry.npmjs.org/@types/babel__template/-/babel__template-7.0.2.tgz",
+      "integrity": "sha512-/K6zCpeW7Imzgab2bLkLEbz0+1JlFSrUMdw7KoIIu+IUdu51GWaBZpd3y1VXGVXzynvGa4DaIaxNZHiON3GXUg==",
+      "dev": true,
+      "requires": {
+        "@babel/parser": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@types/babel__traverse": {
+      "version": "7.0.7",
+      "resolved": "https://registry.npmjs.org/@types/babel__traverse/-/babel__traverse-7.0.7.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.3.0"
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-    "type-detect": {
-      "version": "4.0.8",
-      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
-      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
-      "dev": true
-    },
     "type-fest": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.5.2.tgz",
@@ -1966,12 +7793,81 @@
       "integrity": "sha512-ACzBtm/PhXBDId6a6sDJfroT2pOWt/oOnk4/dElG5G33ZL776N3Y6/6bKZJBFpd+b05F3Ct9qDjMeJmRWtE2/g==",
       "dev": true
     },
+    "uglify-js": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
+      "integrity": "sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "commander": "~2.20.0",
+        "source-map": "~0.6.1"
+      }
+    },
+    "union-value": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+      "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
+      "dev": true,
+      "requires": {
+        "arr-union": "^3.1.0",
+        "get-value": "^2.0.6",
+        "is-extendable": "^0.1.1",
+        "set-value": "^2.0.1"
+      }
+    },
     "uniq": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/uniq/-/uniq-1.0.1.tgz",
       "integrity": "sha1-sxxa6CVIRKOoKBVBzisEuGWnNP8=",
       "dev": true
     },
+    "unset-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dev": true,
+      "requires": {
+        "has-value": "^0.3.1",
+        "isobject": "^3.0.0"
+      },
+      "dependencies": {
+        "has-value": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "dev": true,
+          "requires": {
+            "get-value": "^2.0.3",
+            "has-values": "^0.1.4",
+            "isobject": "^2.0.0"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "2.1.0",
+              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
+              "dev": true,
+              "requires": {
+                "isarray": "1.0.0"
+              }
+            }
+          }
+        },
+        "has-values": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
+          "dev": true
+        },
+        "isarray": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
+          "dev": true
+        }
+      }
+    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -1981,6 +7877,40 @@
         "punycode": "^2.1.0"
       }
     },
+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true
+    },
+    "use": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
+      "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
+      "dev": true
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
+    "util.promisify": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
+      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "object.getownpropertydescriptors": "^2.0.3"
+      }
+    },
+    "uuid": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
+      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
+      "dev": true
+    },
     "v8-compile-cache": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
@@ -1997,6 +7927,67 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
+    "w3c-hr-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.1.tgz",
+      "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
+      "requires": {
+        "browser-process-hrtime": "^0.1.2"
+      }
+    },
+    "walker": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
+      "integrity": "sha1-L3+bj9ENZ3JisYqITijRlhjgKPs=",
+      "dev": true,
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
+    "webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true
+    },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.24"
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==",
+      "dev": true
+    },
+    "whatwg-url": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-6.5.0.tgz",
+      "integrity": "sha512-rhRZRqx/TLJQWUpQ6bmrt2UV4f0HCQ463yQuONJqC6fO2VoEb1pTYddbe59SkYq87aoM5A3bdhMZiUiVws+fzQ==",
+      "dev": true,
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -2006,6 +7997,12 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -2027,12 +8024,44 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
+      "integrity": "sha512-TGHFeZEZMnv+gBFRfjAcxL5bPHrsGKtnb4qsFAws7/vlh+QfwAaySIw4AXP9ZskTTh5GWu3FLuJhsWVdiJPGvg==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
+    "ws": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
+      "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
       "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
       "dev": true
     },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
     "yn": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.0.tgz",
diff --git a/package.json b/package.json
index 39759dc4b..398633769 100644
--- a/package.json
+++ b/package.json
@@ -15,8 +15,8 @@
     "url": "https://github.com/tj/commander.js.git"
   },
   "scripts": {
-    "lint": "eslint index.js",
-    "test": "node test/run.js && npm run test-typings",
+    "lint": "eslint index.js \"tests/**/*.js\"",
+    "test": "jest && npm run test-typings",
     "test-typings": "tsc -p tsconfig.json"
   },
   "main": "index",
@@ -26,10 +26,11 @@
   ],
   "dependencies": {},
   "devDependencies": {
+    "@types/jest": "^24.0.18",
     "@types/node": "^12.7.2",
     "eslint": "^6.1.0",
-    "should": "^13.2.3",
-    "sinon": "^7.4.1",
+    "eslint-plugin-jest": "^22.14.0",
+    "jest": "^24.8.0",
     "standard": "^13.1.0",
     "ts-node": "^8.3.0",
     "typescript": "^3.5.3"
diff --git a/test/fixtures-ts/pm.ts b/test/fixtures-ts/pm.ts
deleted file mode 100644
index 723ccb772..000000000
--- a/test/fixtures-ts/pm.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/usr/bin/env node
-
-var program = require('../../');
-
-program
-    .version('0.0.1')
-    .command('install [name]', 'install one or more packages')
-    .parse(process.argv);
diff --git a/test/fixtures/pm-cache-clear.js b/test/fixtures/pm-cache-clear.js
deleted file mode 100644
index 93666861a..000000000
--- a/test/fixtures/pm-cache-clear.js
+++ /dev/null
@@ -1 +0,0 @@
-console.log('cache-clear')
diff --git a/test/fixtures/pm-cache-validate.js b/test/fixtures/pm-cache-validate.js
deleted file mode 100644
index cfc0e8b25..000000000
--- a/test/fixtures/pm-cache-validate.js
+++ /dev/null
@@ -1 +0,0 @@
-console.log('cache-validate')
diff --git a/test/fixtures/pm-install b/test/fixtures/pm-install
deleted file mode 100755
index 58190eef8..000000000
--- a/test/fixtures/pm-install
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env node
-console.log('install')
-
diff --git a/test/fixtures/pm-listen b/test/fixtures/pm-listen
deleted file mode 100755
index f75e89007..000000000
--- a/test/fixtures/pm-listen
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/usr/bin/env node
-
-process.on('SIGUSR1', function(){
-    console.log('SIGUSR1');
-    process.exit();
-});
-
-process.on('SIGUSR2', function(){
-    console.log('SIGUSR2');
-    process.exit();
-});
-
-process.on('SIGTERM', function(){
-    console.log('SIGTERM');
-    process.exit();
-});
-
-process.on('SIGINT', function(){
-    console.log('SIGINT');
-    process.exit();
-});
-
-process.on('SIGHUP', function(){
-    console.log('SIGHUP');
-    process.exit();
-});
-
-setInterval(function(){}, 5000); // Mimic a running process
\ No newline at end of file
diff --git a/test/fixtures/pm-search b/test/fixtures/pm-search
deleted file mode 100644
index 1807e281c..000000000
--- a/test/fixtures/pm-search
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env node
-console.log('search')
-
diff --git a/test/fixtures/pmlink-install b/test/fixtures/pmlink-install
deleted file mode 100755
index 58190eef8..000000000
--- a/test/fixtures/pmlink-install
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env node
-console.log('install')
-
diff --git a/test/run.js b/test/run.js
deleted file mode 100644
index 45ddce056..000000000
--- a/test/run.js
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/usr/bin/env node
-
-const { spawnSync } = require('child_process')
-const { readdirSync } = require('fs')
-const { extname, join } = require('path')
-
-process.env.NODE_ENV = 'test';
-
-process.stdout.write('\n')
-readdirSync(__dirname).forEach((file) => {
-  if (!file.startsWith('test.') || extname(file) !== '.js')
-    return;
-  process.stdout.write(`\x1b[90m   ${file}\x1b[0m `);
-  const result = spawnSync(process.argv0, [ join('test', file) ]);
-  if (result.status === 0) {
-    process.stdout.write('\x1b[36m✓\x1b[0m\n');
-  } else {
-    process.stdout.write('\x1b[31m✖\x1b[0m\n');
-    console.error(result.stderr.toString('utf8'));
-    process.exit(result.status);
-  }
-})
diff --git a/test/test.arguments.js b/test/test.arguments.js
deleted file mode 100644
index b4dfa6df6..000000000
--- a/test/test.arguments.js
+++ /dev/null
@@ -1,30 +0,0 @@
-/**
- * Top-level command syntax.
- */
-
-var program = require('../')
-  , should = require('should');
-
-var envValue = "";
-var cmdValue = "";
-
-program
-  .version('0.0.1')
-  .arguments('<cmd> [env]')
-  .action(function (cmd, env) {
-    cmdValue = cmd;
-    envValue = env;
-  })
-  .option('-C, --chdir <path>', 'change the working directory')
-  .option('-c, --config <path>', 'set config path. defaults to ./deploy.conf')
-  .option('-T, --no-tests', 'ignore test hook');
-
-program.parse(['node', 'test', '--config', 'conf']);
-program.config.should.equal("conf");
-cmdValue.should.equal("");
-envValue.should.equal("");
-
-program.parse(['node', 'test', '--config', 'conf1', 'setup', '--setup_mode', 'mode3', 'env1']);
-program.config.should.equal("conf1");
-cmdValue.should.equal("setup");
-envValue.should.equal("env1");
diff --git a/test/test.command.action.emptyOption.js b/test/test.command.action.emptyOption.js
deleted file mode 100644
index 33276754f..000000000
--- a/test/test.command.action.emptyOption.js
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-var val = "some cheese"
-program
-  .name('test')
-  .command('mycommand')
-  .option('-c, --cheese [type]', 'optionally specify the type of cheese')
-  .action(function(cmd) {
-    val = cmd.cheese;
-  });
-
-program.parse(['node', 'test', 'mycommand', '--cheese', '']);
-
-val.should.equal('');
-
diff --git a/test/test.command.action.js b/test/test.command.action.js
deleted file mode 100644
index 2989ac6ff..000000000
--- a/test/test.command.action.js
+++ /dev/null
@@ -1,14 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-var val = false;
-program
-  .command('info [options]')
-  .option('-C, --no-color', 'turn off color output')
-  .action(function () {
-    val = this.color;
-  });
-
-program.parse(['node', 'test', 'info']);
-
-program.commands[0].color.should.equal(val);
diff --git a/test/test.command.alias.help.js b/test/test.command.alias.help.js
deleted file mode 100644
index 0425ec602..000000000
--- a/test/test.command.alias.help.js
+++ /dev/null
@@ -1,20 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-program
-  .command('info [thing]')
-  .alias('i')
-  .action(function () {
-  });
-
-program
-  .command('save [file]')
-  .alias('s')
-  .action(function() {
-  });
-
-program.parse(['node', 'test']);
-
-program.commandHelp().should.containEql('info|i');
-program.commandHelp().should.containEql('save|s');
-program.commandHelp().should.not.containEql('test|');
diff --git a/test/test.command.allowUnknownOption.js b/test/test.command.allowUnknownOption.js
deleted file mode 100644
index 598d21d4d..000000000
--- a/test/test.command.allowUnknownOption.js
+++ /dev/null
@@ -1,58 +0,0 @@
-/**
- * Module dependencies.
- */
-var program = require('../')
-    , sinon = require('sinon').sandbox.create()
-    , should = require('should');
-
-var stubError = sinon.stub(console, 'error');
-var stubExit = sinon.stub(process, 'exit');
-
-program
-  .version('0.0.1')
-  .option('-p, --pepper', 'add pepper');
-program.parse('node test -m'.split(' '));
-
-stubError.callCount.should.equal(1);
-
-
-// test subcommand
-resetStubStatus();
-program
-  .command('sub')
-  .action(function () {
-  });
-program.parse('node test sub -m'.split(' '));
-
-stubError.callCount.should.equal(1);
-stubExit.calledOnce.should.be.true();
-
-// command with `allowUnknownOption`
-resetStubStatus();
-program
-  .version('0.0.1')
-  .option('-p, --pepper', 'add pepper');
-program
-  .allowUnknownOption()
-  .parse('node test -m'.split(' '));
-
-stubError.callCount.should.equal(0);
-stubExit.calledOnce.should.be.false();
-
-// subcommand with `allowUnknownOption`
-resetStubStatus();
-program
-  .command('sub2')
-  .allowUnknownOption()
-  .action(function () {
-  });
-program.parse('node test sub2 -m'.split(' '));
-
-stubError.callCount.should.equal(0);
-stubExit.calledOnce.should.be.false();
-
-
-function resetStubStatus() {
-  stubError.reset();
-  stubExit.reset();
-}
diff --git a/test/test.command.executableSubcommand.inspect.js b/test/test.command.executableSubcommand.inspect.js
deleted file mode 100644
index fbe79b340..000000000
--- a/test/test.command.executableSubcommand.inspect.js
+++ /dev/null
@@ -1,50 +0,0 @@
-const exec = require('child_process').exec;
-const path = require('path');
-const should = require('should');
-
-var inspectCommand = path.join(__dirname, 'fixtures', 'inspect.js');
-
-exec(`node ${inspectCommand} sub`, function(_error, stdout, stderr) {
-  stdout.should.equal('[]\n');
-});
-
-exec(`node --harmony ${inspectCommand} sub`, function(_error, stdout, stderr) {
-  stdout.should.equal("[ '--harmony' ]\n");
-});
-
-// Skip tests for node 6 when --inspect was only prototype
-if (process.version.substr(1).split('.')[0] === '6') {
-  console.log('Skipping --inspect tests for node 6');
-} else {
-  // Test that inspector port gets incremented.
-  // If we reuse port we can get conflicts because port not released fast enough.
-
-  // --inspect defaults to 127.0.0.1:9229, port should be incremented
-  exec(`node --inspect ${inspectCommand} sub`, function(_error, stdout, stderr) {
-    stdout.should.equal("[ '--inspect=127.0.0.1:9230' ]\n");
-  });
-
-  // custom port
-  exec(`node --inspect=9240 ${inspectCommand} sub`, function(_error, stdout, stderr) {
-    stdout.should.equal("[ '--inspect=127.0.0.1:9241' ]\n");
-  });
-  // zero is special, random port
-  exec(`node --inspect=0 ${inspectCommand} sub`, function(_error, stdout, stderr) {
-    stdout.should.equal("[ '--inspect=0' ]\n");
-  });
-
-  // ip address
-  exec(`node --inspect=127.0.0.1:9250 ${inspectCommand} sub`, function(_error, stdout, stderr) {
-    stdout.should.equal("[ '--inspect=127.0.0.1:9251' ]\n");
-  });
-
-  // localhost
-  exec(`node --inspect=localhost:9260 ${inspectCommand} sub`, function(_error, stdout, stderr) {
-    stdout.should.equal("[ '--inspect=localhost:9261' ]\n");
-  });
-
-  // --inspect-port, just test most likely format
-  exec(`node --inspect-port=9270 ${inspectCommand} sub`, function(_error, stdout, stderr) {
-    stdout.should.equal("[ '--inspect-port=127.0.0.1:9271' ]\n");
-  });
-}
diff --git a/test/test.command.executableSubcommand.js b/test/test.command.executableSubcommand.js
deleted file mode 100644
index b9c720c04..000000000
--- a/test/test.command.executableSubcommand.js
+++ /dev/null
@@ -1,43 +0,0 @@
-var exec = require('child_process').exec
-  , path = require('path')
-  , should = require('should');
-
-
-
-var bin = path.join(__dirname, './fixtures/pm')
-// not exist
-exec(bin + ' list', function (error, stdout, stderr) {
-  //stderr.should.equal('\n  pm-list(1) does not exist, try --help\n\n');
-  // TODO error info are not the same in between <=v0.8 and later version
-  should.notEqual(0, stderr.length);
-});
-
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
-
-// subcommand bin file with explicit extension
-exec(bin + ' publish', function (error, stdout, stderr) {
-  stdout.should.equal('publish\n');
-});
-
-// spawn EACCES
-exec(bin + ' search', function (error, stdout, stderr) {
-  // TODO error info are not the same in between <v0.10 and v0.12
-  should.notEqual(0, stderr.length);
-});
-
-// when `bin` is a symbol link for mocking global install
-var bin = path.join(__dirname, './fixtures/pmlink')
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
-
-// when `bin` is a symbol link pointing at a symbolic for mocking global install
-var bin = path.join(__dirname, './fixtures/another-dir/pm')
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
diff --git a/test/test.command.executableSubcommand.signals.hup.js b/test/test.command.executableSubcommand.signals.hup.js
deleted file mode 100644
index 76b468a0b..000000000
--- a/test/test.command.executableSubcommand.signals.hup.js
+++ /dev/null
@@ -1,22 +0,0 @@
-var spawn = require('child_process').spawn,
-  path = require('path'),
-  should = require('should');
-
-var bin = path.join(__dirname, './fixtures/pm');
-var proc = spawn(bin, ['listen'], {});
-
-var output = '';
-proc.stdout.on('data', function (data) {
-  output += data.toString();
-});
-
-// Set a timeout to give 'proc' time to setup completely
-setTimeout(function () {
-  proc.kill('SIGHUP');
-
-  // Set another timeout to give 'prog' time to handle the signal
-  setTimeout(function() {
-    output.should.equal('SIGHUP\n');
-  }, 1000);
-
-}, 2000);
\ No newline at end of file
diff --git a/test/test.command.executableSubcommand.signals.int.js b/test/test.command.executableSubcommand.signals.int.js
deleted file mode 100644
index 2dd396652..000000000
--- a/test/test.command.executableSubcommand.signals.int.js
+++ /dev/null
@@ -1,22 +0,0 @@
-var spawn = require('child_process').spawn,
-  path = require('path'),
-  should = require('should');
-
-var bin = path.join(__dirname, './fixtures/pm');
-var proc = spawn(bin, ['listen'], {});
-
-var output = '';
-proc.stdout.on('data', function (data) {
-  output += data.toString();
-});
-
-// Set a timeout to give 'proc' time to setup completely
-setTimeout(function () {
-  proc.kill('SIGINT');
-
-  // Set another timeout to give 'prog' time to handle the signal
-  setTimeout(function() {
-    output.should.equal('SIGINT\n');
-  }, 1000);
-
-}, 2000);
\ No newline at end of file
diff --git a/test/test.command.executableSubcommand.signals.term.js b/test/test.command.executableSubcommand.signals.term.js
deleted file mode 100644
index e4449c8bb..000000000
--- a/test/test.command.executableSubcommand.signals.term.js
+++ /dev/null
@@ -1,22 +0,0 @@
-var spawn = require('child_process').spawn,
-  path = require('path'),
-  should = require('should');
-
-var bin = path.join(__dirname, './fixtures/pm');
-var proc = spawn(bin, ['listen'], {});
-
-var output = '';
-proc.stdout.on('data', function (data) {
-  output += data.toString();
-});
-
-// Set a timeout to give 'proc' time to setup completely
-setTimeout(function () {
-  proc.kill('SIGTERM');
-
-  // Set another timeout to give 'prog' time to handle the signal
-  setTimeout(function() {
-    output.should.equal('SIGTERM\n');
-  }, 1000);
-
-}, 2000);
\ No newline at end of file
diff --git a/test/test.command.executableSubcommand.signals.usr1.js b/test/test.command.executableSubcommand.signals.usr1.js
deleted file mode 100644
index 6a2bbea9c..000000000
--- a/test/test.command.executableSubcommand.signals.usr1.js
+++ /dev/null
@@ -1,33 +0,0 @@
-var spawn = require('child_process').spawn,
-  path = require('path'),
-  should = require('should');
-
-var bin = path.join(__dirname, './fixtures/pm');
-var proc = spawn(bin, ['listen'], {});
-
-var output = '';
-proc.stdout.on('data', function (data) {
-  output += data.toString();
-});
-
-// Set a timeout to give 'proc' time to setup completely
-setTimeout(function () {
-  proc.kill('SIGUSR1');
-
-  // Set another timeout to give 'prog' time to handle the signal
-  setTimeout(function() {
-    /*
-     * As described at https://nodejs.org/api/process.html#process_signal_events
-     * this signal will start a debugger and thus the process might output an
-     * additional error message: 
-     * 
-     *    "Failed to open socket on port 5858, waiting 1000 ms before retrying".
-     * 
-     * Therefore, we are a bit more lax in matching the output.
-     * It must contain the expected output, meaning an empty line containing
-     * only "SIGUSR1", but any other output is also allowed.
-     */
-    output.should.match(/(^|\n)SIGUSR1\n/);
-  }, 1000);
-
-}, 2000);
\ No newline at end of file
diff --git a/test/test.command.executableSubcommand.signals.usr2.js b/test/test.command.executableSubcommand.signals.usr2.js
deleted file mode 100644
index fb902faa7..000000000
--- a/test/test.command.executableSubcommand.signals.usr2.js
+++ /dev/null
@@ -1,22 +0,0 @@
-var spawn = require('child_process').spawn,
-  path = require('path'),
-  should = require('should');
-
-var bin = path.join(__dirname, './fixtures/pm');
-var proc = spawn(bin, ['listen'], {});
-
-var output = '';
-proc.stdout.on('data', function (data) {
-  output += data.toString();
-});
-
-// Set a timeout to give 'proc' time to setup completely
-setTimeout(function () {
-  proc.kill('SIGUSR2');
-
-  // Set another timeout to give 'prog' time to handle the signal
-  setTimeout(function() {
-    output.should.equal('SIGUSR2\n');
-  }, 1000);
-
-}, 2000);
\ No newline at end of file
diff --git a/test/test.command.executableSubcommand.tsnode.js b/test/test.command.executableSubcommand.tsnode.js
deleted file mode 100644
index c7e5524cc..000000000
--- a/test/test.command.executableSubcommand.tsnode.js
+++ /dev/null
@@ -1,10 +0,0 @@
-var exec = require('child_process').exec
-  , path = require('path')
-  , should = require('should');
-
-var bin = path.join(__dirname, './fixtures-ts/pm.ts')
-
-// success case
-exec(process.argv[0] + ' -r ts-node/register ' + bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
diff --git a/test/test.command.executableSubcommandAlias.help.js b/test/test.command.executableSubcommandAlias.help.js
deleted file mode 100644
index 1f73860a5..000000000
--- a/test/test.command.executableSubcommandAlias.help.js
+++ /dev/null
@@ -1,17 +0,0 @@
-var exec = require('child_process').exec
-  , path = require('path')
-  , should = require('should');
-
-
-
-var bin = path.join(__dirname, './fixtures/pm')
-
-// success case
-exec(bin + ' help', function (error, stdout, stderr) {
-  stdout.should.containEql('install|i');
-  stdout.should.containEql('search|s');
-  stdout.should.containEql('cache|c');
-  stdout.should.containEql('list');
-  stdout.should.containEql('publish|p');
-  stdout.should.not.containEql('pm|');
-});
diff --git a/test/test.command.executableSubcommandAlias.js b/test/test.command.executableSubcommandAlias.js
deleted file mode 100644
index 0bf1fb0f4..000000000
--- a/test/test.command.executableSubcommandAlias.js
+++ /dev/null
@@ -1,35 +0,0 @@
-var exec = require('child_process').exec
-  , path = require('path')
-  , should = require('should');
-
-var bin = path.join(__dirname, './fixtures/pm')
-
-// success case
-exec(bin + ' i', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
-
-// subcommand bin file with explicit extension
-exec(bin + ' p', function (error, stdout, stderr) {
-  stdout.should.equal('publish\n');
-});
-
-// spawn EACCES
-exec(bin + ' s', function (error, stdout, stderr) {
-  // error info are not the same in between <v0.10 and v0.12
-  should.notEqual(0, stderr.length);
-});
-
-// when `bin` is a symbol link for mocking global install
-var bin = path.join(__dirname, './fixtures/pmlink')
-// success case
-exec(bin + ' i', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
-
-// when `bin` is a symbol link pointing at a symbolic for mocking global install
-var bin = path.join(__dirname, './fixtures/another-dir/pm')
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
diff --git a/test/test.command.executableSubcommandDefault.js b/test/test.command.executableSubcommandDefault.js
deleted file mode 100644
index cf6d773a8..000000000
--- a/test/test.command.executableSubcommandDefault.js
+++ /dev/null
@@ -1,53 +0,0 @@
-var exec = require('child_process').exec
-  , path = require('path')
-  , should = require('should');
-
-
-
-var bin = path.join(__dirname, './fixtures/pm')
-// success case
-exec(bin + ' default', function(error, stdout, stderr) {
-  stdout.should.equal('default\n');
-});
-
-// success case (default)
-exec(bin, function(error, stdout, stderr) {
-  stdout.should.equal('default\n');
-});
-
-// not exist
-exec(bin + ' list', function (error, stdout, stderr) {
-  //stderr.should.equal('\n  pm-list(1) does not exist, try --help\n\n');
-  // TODO error info are not the same in between <=v0.8 and later version
-  should.notEqual(0, stderr.length);
-});
-
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
-
-// subcommand bin file with explicit extension
-exec(bin + ' publish', function (error, stdout, stderr) {
-  stdout.should.equal('publish\n');
-});
-
-// spawn EACCES
-exec(bin + ' search', function (error, stdout, stderr) {
-  // TODO error info are not the same in between <v0.10 and v0.12
-  should.notEqual(0, stderr.length);
-});
-
-// when `bin` is a symbol link for mocking global install
-var bin = path.join(__dirname, './fixtures/pmlink')
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
-
-// when `bin` is a symbol link pointing at a symbolic for mocking global install
-var bin = path.join(__dirname, './fixtures/another-dir/pm')
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
diff --git a/test/test.command.executableSubcommandSpecifySubcommand.js b/test/test.command.executableSubcommandSpecifySubcommand.js
deleted file mode 100644
index 26e20564b..000000000
--- a/test/test.command.executableSubcommandSpecifySubcommand.js
+++ /dev/null
@@ -1,44 +0,0 @@
-var exec = require('child_process').exec
-  , path = require('path')
-  , should = require('should');
-
-
-
-var bin = path.join(__dirname, './fixtures/pm')
-// success case
-exec(bin + ' specifyInstall', function(error, stdout, stderr) {
-  // Optionally specify `pm-install`
-  stdout.should.equal('install\n');
-});
-exec(bin + ' specifyPublish', function(error, stdout, stderr) {
-  // Optionally specify `pm-publish`
-  stdout.should.equal('publish\n');
-});
-
-// not exist
-exec(bin + ' list', function (error, stdout, stderr) {
-  //stderr.should.equal('\n  pm-list(1) does not exist, try --help\n\n');
-  should.notEqual(0, stderr.length);
-});
-
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
-
-// subcommand bin file with explicit extension
-exec(bin + ' publish', function (error, stdout, stderr) {
-  stdout.should.equal('publish\n');
-});
-
-// spawn EACCES
-exec(bin + ' search', function (error, stdout, stderr) {
-  should.notEqual(0, stderr.length);
-});
-
-// when `bin` is a symbol link for mocking global install
-var bin = path.join(__dirname, './fixtures/pmlink')
-// success case
-exec(bin + ' install', function (error, stdout, stderr) {
-  stdout.should.equal('install\n');
-});
diff --git a/test/test.command.executableSubcommandSubCommand.js b/test/test.command.executableSubcommandSubCommand.js
deleted file mode 100644
index 53c824132..000000000
--- a/test/test.command.executableSubcommandSubCommand.js
+++ /dev/null
@@ -1,32 +0,0 @@
-var exec = require('child_process').exec
-  , path = require('path')
-  , should = require('should');
-
-
-/*
- * The commands look like this
- * pm cache
- * pm cache clear
- * pm cache validate (default)
- */
-
-var bin = path.join(__dirname, './fixtures/pm')
-// should list commands at top-level sub command
-exec(bin + ' cache help', function (error, stdout, stderr) {
-  stdout.should.containEql('Usage:');
-  stdout.should.containEql('cache');
-  stdout.should.containEql('validate');
-});
-
-// should run sub-subcommand
-exec(bin + ' cache clear', function (error, stdout, stderr) {
-  stdout.should.equal('cache-clear\n');
-  stderr.should.equal('');
-});
-
-// should print the default command when passed invalid sub-subcommand
-exec(bin + ' cache nope', function (error, stdout, stderr) {
-  stdout.should.equal('cache-validate\n');
-  stderr.should.equal('');
-});
-
diff --git a/test/test.command.failOnSameAlias.js b/test/test.command.failOnSameAlias.js
deleted file mode 100644
index 6b7527631..000000000
--- a/test/test.command.failOnSameAlias.js
+++ /dev/null
@@ -1,14 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-var error;
-
-try {
-  program
-    .command('fail')
-    .alias('fail');
-} catch (e) {
-  error = e;
-}
-
-error.should.deepEqual(new Error('Command alias can\'t be the same as its name'));
diff --git a/test/test.command.help.js b/test/test.command.help.js
deleted file mode 100644
index 18a6bc7c3..000000000
--- a/test/test.command.help.js
+++ /dev/null
@@ -1,12 +0,0 @@
-var program = require('../')
-  , sinon = require('sinon').sandbox.create()
-  , should = require('should');
-
-
-program.command('bare');
-
-program.commandHelp().should.equal('Commands:\n  bare\n');
-
-program.command('mycommand [options]');
-
-program.commandHelp().should.equal('Commands:\n  bare\n  mycommand [options]\n');
diff --git a/test/test.command.helpInformation.custom.js b/test/test.command.helpInformation.custom.js
deleted file mode 100644
index 50ad9ab91..000000000
--- a/test/test.command.helpInformation.custom.js
+++ /dev/null
@@ -1,46 +0,0 @@
-var program = require('../')
-  , sinon = require('sinon').sandbox.create()
-  , should = require('should');
-
-sinon.stub(process, 'exit');
-sinon.stub(process.stdout, 'write');
-
-program.helpOption('-c, --HELP', 'custom help output');
-program.command('somecommand');
-program.command('anothercommand [options]');
-
-var expectedHelpInformation = [
-  'Usage:  [options] [command]',
-  '',
-  'Options:',
-  '  -c, --HELP                custom help output',
-  '',
-  'Commands:',
-  '  somecommand',
-  '  anothercommand [options]',
-  ''
-].join('\n');
-
-program.helpInformation().should.equal(expectedHelpInformation);
-
-// Test arguments
-var expectedCommandHelpInformation = [
-  'Usage: test [options] [command]',
-  '',
-  'Options:',
-  '  -c, --HELP                custom help output',
-  '',
-  'Commands:',
-  '  somecommand',
-  '  anothercommand [options]',
-  ''
-].join('\n');
-
-program.parse(['node', 'test', '--HELP']);
-
-process.stdout.write.called.should.equal(true);
-
-var output = process.stdout.write.args[0];
-output[0].should.equal(expectedCommandHelpInformation);
-
-sinon.restore();
diff --git a/test/test.command.helpInformation.js b/test/test.command.helpInformation.js
deleted file mode 100644
index 5ec9c3ab8..000000000
--- a/test/test.command.helpInformation.js
+++ /dev/null
@@ -1,21 +0,0 @@
-var program = require('../')
-  , sinon = require('sinon').sandbox.create()
-  , should = require('should');
-
-
-program.command('somecommand');
-program.command('anothercommand [options]');
-
-var expectedHelpInformation = [
-  'Usage:  [options] [command]',
-  '',
-  'Options:',
-  '  -h, --help                output usage information',
-  '',
-  'Commands:',
-  '  somecommand',
-  '  anothercommand [options]',
-  ''
-].join('\n');
-
-program.helpInformation().should.equal(expectedHelpInformation);
diff --git a/test/test.command.helpSubCommand.customFlags.js b/test/test.command.helpSubCommand.customFlags.js
deleted file mode 100644
index d54a0348f..000000000
--- a/test/test.command.helpSubCommand.customFlags.js
+++ /dev/null
@@ -1,65 +0,0 @@
-var program = require('../'),
-  sinon = require('sinon').sandbox.create(),
-  should = require('should');
-
-sinon.stub(process, 'exit');
-sinon.stub(process.stdout, 'write');
-
-// Test that subcommands inherit the help flags
-// but can also override help flags
-program
-  .helpOption('-i, --ihelp', 'foo foo');
-
-program
-  .command('child')
-  .option('--gender', 'specific gender of child')
-  .action((cmd) => {
-    console.log('Childsubcommand...');
-  });
-
-program
-  .command('family')
-  .helpOption('-h, --help')
-  .action((cmd) => {
-    console.log('Familysubcommand...');
-  });
-
-// Test arguments
-var expectedCommandHelpInformation = [
-  'Usage: test child [options]',
-  '',
-  'Options:',
-  '  --gender     specific gender of child',
-  '  -i, --ihelp  foo foo',
-  ''
-].join('\n');
-
-program.parse(['node', 'test', 'child', '-i']);
-
-process.stdout.write.called.should.equal(true);
-
-var output = process.stdout.write.args[0];
-output[0].should.equal(expectedCommandHelpInformation);
-
-// Test other command
-sinon.restore();
-
-sinon.stub(process, 'exit');
-sinon.stub(process.stdout, 'write');
-
-var expectedFamilyCommandHelpInformation = [
-  'Usage: test family [options]',
-  '',
-  'Options:',
-  '  -h, --help  foo foo',
-  ''
-].join('\n');
-
-program.parse(['node', 'test', 'family', '-h']);
-
-process.stdout.write.called.should.equal(true);
-
-var output2 = process.stdout.write.args[0];
-output2[0].should.equal(expectedFamilyCommandHelpInformation);
-
-sinon.restore();
diff --git a/test/test.command.name.js b/test/test.command.name.js
deleted file mode 100644
index 0d783e9c9..000000000
--- a/test/test.command.name.js
+++ /dev/null
@@ -1,24 +0,0 @@
-var program = require('../')
-  , sinon = require('sinon').sandbox.create()
-  , should = require('should');
-
-sinon.stub(process, 'exit');
-sinon.stub(process.stdout, 'write');
-
-program
-  .command('mycommand [options]', 'this is my command');
-
-program.parse(['node', 'test']);
-
-program.name.should.be.a.Function();
-program.name().should.equal('test');
-program.commands[0].name().should.equal('mycommand');
-program.commands[1].name().should.equal('help');
-
-var output = process.stdout.write.args[0];
-
-output[0].should.containEql([
-  '  mycommand [options]  this is my command'
-].join('\n'));
-
-sinon.restore();
diff --git a/test/test.command.name.set.js b/test/test.command.name.set.js
deleted file mode 100644
index a251e67c1..000000000
--- a/test/test.command.name.set.js
+++ /dev/null
@@ -1,16 +0,0 @@
-var program = require('../')
-  , sinon = require('sinon').sandbox.create()
-  , should = require('should');
-
-sinon.stub(process, 'exit');
-sinon.stub(process.stdout, 'write');
-
-program.name('foobar').description('This is a test.');
-
-program.name.should.be.a.Function();
-program.name().should.equal('foobar');
-program.description().should.equal('This is a test.');
-
-var output = process.stdout.write.args[0];
-
-sinon.restore();
diff --git a/test/test.command.noConflict.js b/test/test.command.noConflict.js
deleted file mode 100644
index dc772af88..000000000
--- a/test/test.command.noConflict.js
+++ /dev/null
@@ -1,25 +0,0 @@
-var program = require('../')
-  , sinon = require('sinon')
-  , should = require('should');
-
-sinon.stub(process, 'exit');
-sinon.stub(process.stdout, 'write');
-
-program
-  .version('0.0.1')
-  .command('version')
-  .action(function() {
-    console.log('Version command invoked');
-  });
-
-program.parse(['node', 'test', 'version']);
-
-var output = process.stdout.write.args[0];
-output[0].should.equal('Version command invoked\n');
-
-program.parse(['node', 'test', '--version']);
-
-var output = process.stdout.write.args[1];
-output[0].should.equal('0.0.1\n');
-
-sinon.restore();
diff --git a/test/test.command.nohelp.js b/test/test.command.nohelp.js
deleted file mode 100644
index a56972185..000000000
--- a/test/test.command.nohelp.js
+++ /dev/null
@@ -1,55 +0,0 @@
-var program = require('../')
-	, sinon = require('sinon').sandbox.create()
-  , should = require('should');
-
-sinon.stub(process, 'exit');
-sinon.stub(process.stdout, 'write');
-
-program.command('mycommand [options]', 'this is my command');
-
-program
-	.command('anothercommand [options]')
-  .action(function() { return; });
-
-program.command('hiddencommand [options]', 'you won\'t see me', { noHelp: true });
-
-program
-	.command('hideagain [options]', null, { noHelp: true })
-  .action(function() { return; });
-
-program.command('hiddencommandwithoutdescription [options]', { noHelp: true });
-
-program.parse(['node', 'test']);
-
-program.name.should.be.a.Function();
-program.name().should.equal('test');
-program.commands[0].name().should.equal('mycommand');
-program.commands[0]._noHelp.should.be.false();
-program.commands[1].name().should.equal('anothercommand');
-program.commands[1]._noHelp.should.be.false();
-program.commands[2].name().should.equal('hiddencommand');
-program.commands[2]._noHelp.should.be.true();
-program.commands[3].name().should.equal('hideagain');
-program.commands[3]._noHelp.should.be.true();
-program.commands[4].name().should.equal('hiddencommandwithoutdescription');
-program.commands[4]._noHelp.should.be.true();
-program.commands[5].name().should.equal('help');
-
-
-
-sinon.restore();
-sinon.stub(process.stdout, 'write');
-program.outputHelp();
-
-process.stdout.write.calledOnce.should.be.true();
-process.stdout.write.args.length.should.equal(1);
-
-var output = process.stdout.write.args[0];
-
-var expect = [
-	'Commands:',
-	'  mycommand [options]       this is my command',
-	'  anothercommand [options]',
-	'  help [cmd]                display help for [cmd]'
-].join('\n');
-output[0].indexOf(expect).should.not.be.equal(-1);
diff --git a/test/test.command.usage.js b/test/test.command.usage.js
deleted file mode 100644
index f7c9d69db..000000000
--- a/test/test.command.usage.js
+++ /dev/null
@@ -1,8 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-program
-  .name('test')
-  .command('info [options]')
-
-program.commands[0].helpInformation().should.startWith('Usage: test info [options]')
diff --git a/test/test.commandAsterisk.action.js b/test/test.commandAsterisk.action.js
deleted file mode 100644
index d72381054..000000000
--- a/test/test.commandAsterisk.action.js
+++ /dev/null
@@ -1,15 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-var val = false;
-program
-  .version('0.0.1')
-  .command('*')
-  .description('test')
-  .action(function () {
-    val = true;
-  });
-
-program.parse(['node', 'test']);
-
-val.should.be.false()
diff --git a/test/test.literal.args.js b/test/test.literal.args.js
deleted file mode 100644
index 9cc938948..000000000
--- a/test/test.literal.args.js
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('-f, --foo', 'add some foo')
-  .option('-b, --bar', 'add some bar');
-
-program.parse(['node', 'test', '--foo', '--', '--bar', 'baz']);
-program.foo.should.be.true();
-should.equal(undefined, program.bar);
-program.args.should.eql(['--bar', 'baz']);
-
-// subsequent literals are passed-through as args
-program.parse(['node', 'test', '--', 'cmd', '--', '--arg']);
-program.args.should.eql(['cmd', '--', '--arg']);
\ No newline at end of file
diff --git a/test/test.noCommand.action.js b/test/test.noCommand.action.js
deleted file mode 100644
index ae4aecc66..000000000
--- a/test/test.noCommand.action.js
+++ /dev/null
@@ -1,13 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-var val = false;
-program
-  .option('-C, --no-color', 'turn off color output')
-  .action(function () {
-    val = this.color;
-  });
-
-program.parse(['node', 'test']);
-
-program.color.should.equal(val);
diff --git a/test/test.options.args.optional.given.js b/test/test.options.args.optional.given.js
deleted file mode 100644
index 86e9d1401..000000000
--- a/test/test.options.args.optional.given.js
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('-c, --cheese [type]', 'optionally specify the type of cheese');
-
-program.parse(['node', 'test', '--cheese', 'feta']);
-program.cheese.should.equal('feta');
diff --git a/test/test.options.args.optional.js b/test/test.options.args.optional.js
deleted file mode 100644
index d36b384be..000000000
--- a/test/test.options.args.optional.js
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('-c, --cheese [type]', 'optionally specify the type of cheese');
-
-program.parse(['node', 'test', '--cheese']);
-program.cheese.should.be.true();
diff --git a/test/test.options.args.required.js b/test/test.options.args.required.js
deleted file mode 100644
index 826900a22..000000000
--- a/test/test.options.args.required.js
+++ /dev/null
@@ -1,26 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var util = require('util')
-  , program = require('../')
-  , should = require('should');
-
-var info = [];
-
-console.error = function () {
-  info.push(util.format.apply(util, arguments));
-};
-
-process.on('exit', function (code) {
-  code.should.equal(1);
-  info.length.should.equal(1);
-  info[0].should.equal("error: option '-c, --cheese <type>' argument missing");
-  process.exit(0)
-});
-
-program
-  .version('0.0.1')
-  .option('-c, --cheese <type>', 'optionally specify the type of cheese');
-
-program.parse(['node', 'test', '--cheese']);
diff --git a/test/test.options.bool.js b/test/test.options.bool.js
deleted file mode 100644
index e992b9ea6..000000000
--- a/test/test.options.bool.js
+++ /dev/null
@@ -1,22 +0,0 @@
-const commander = require('../');
-require('should');
-
-// Test simple flag and negatable flag
-
-function simpleFlagProgram() {
-  const program = new commander.Command();
-  program
-    .option('-p, --pepper', 'add pepper')
-    .option('-C, --no-cheese', 'remove cheese');
-  return program;
-}
-
-const simpleFlagNoOptions = simpleFlagProgram();
-simpleFlagNoOptions.parse(['node', 'test']);
-simpleFlagNoOptions.should.not.have.property('pepper');
-simpleFlagNoOptions.cheese.should.be.true();
-
-const simpleFlagLong = simpleFlagProgram();
-simpleFlagLong.parse(['node', 'test', '--pepper', '--no-cheese']);
-simpleFlagLong.pepper.should.be.true();
-simpleFlagLong.cheese.should.be.false();
diff --git a/test/test.options.bool.no.js b/test/test.options.bool.no.js
deleted file mode 100644
index caab58351..000000000
--- a/test/test.options.bool.no.js
+++ /dev/null
@@ -1,63 +0,0 @@
-const commander = require('../');
-require('should');
-
-// Test combination of flag and --no-flag
-// (negatable flag on its own is tested in test.options.bool.js)
-
-function flagProgram(defaultValue) {
-  const program = new commander.Command();
-  program
-    .option('-p, --pepper', 'add pepper', defaultValue)
-    .option('-P, --no-pepper', 'remove pepper');
-  return program;
-}
-
-// Flag with no default, normal usage.
-
-const programNoDefaultNoOptions = flagProgram();
-programNoDefaultNoOptions.parse(['node', 'test']);
-programNoDefaultNoOptions.should.not.have.property('pepper');
-
-const programNoDefaultWithFlag = flagProgram();
-programNoDefaultWithFlag.parse(['node', 'test', '--pepper']);
-programNoDefaultWithFlag.pepper.should.be.true();
-
-const programNoDefaultWithNegFlag = flagProgram();
-programNoDefaultWithNegFlag.parse(['node', 'test', '--no-pepper']);
-programNoDefaultWithNegFlag.pepper.should.be.false();
-
-// Flag with default, say from an environment variable.
-
-const programTrueDefaultNoOptions = flagProgram(true);
-programTrueDefaultNoOptions.parse(['node', 'test']);
-programTrueDefaultNoOptions.pepper.should.be.true();
-
-const programTrueDefaultWithFlag = flagProgram(true);
-programTrueDefaultWithFlag.parse(['node', 'test', '-p']);
-programTrueDefaultWithFlag.pepper.should.be.true();
-
-const programTrueDefaultWithNegFlag = flagProgram(true);
-programTrueDefaultWithNegFlag.parse(['node', 'test', '-P']);
-programTrueDefaultWithNegFlag.pepper.should.be.false();
-
-const programFalseDefaultNoOptions = flagProgram(false);
-programFalseDefaultNoOptions.parse(['node', 'test']);
-programFalseDefaultNoOptions.pepper.should.be.false();
-
-const programFalseDefaultWithFlag = flagProgram(false);
-programFalseDefaultWithFlag.parse(['node', 'test', '-p']);
-programFalseDefaultWithFlag.pepper.should.be.true();
-
-const programFalseDefaultWithNegFlag = flagProgram(false);
-programFalseDefaultWithNegFlag.parse(['node', 'test', '-P']);
-programFalseDefaultWithNegFlag.pepper.should.be.false();
-
-// Flag specified both ways, last one wins.
-
-const programNoYes = flagProgram();
-programNoYes.parse(['node', 'test', '--no-pepper', '--pepper']);
-programNoYes.pepper.should.be.true();
-
-const programYesNo = flagProgram();
-programYesNo.parse(['node', 'test', '--pepper', '--no-pepper']);
-programYesNo.pepper.should.be.false();
diff --git a/test/test.options.bool.small.combined.js b/test/test.options.bool.small.combined.js
deleted file mode 100644
index 9ee3a793c..000000000
--- a/test/test.options.bool.small.combined.js
+++ /dev/null
@@ -1,15 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('-p, --pepper', 'add pepper')
-  .option('-c, --no-cheese', 'remove cheese');
-
-program.parse(['node', 'test', '-pc']);
-program.pepper.should.be.true();
-program.cheese.should.be.false();
diff --git a/test/test.options.bool.small.js b/test/test.options.bool.small.js
deleted file mode 100644
index 0199450fd..000000000
--- a/test/test.options.bool.small.js
+++ /dev/null
@@ -1,11 +0,0 @@
-var program = require('../');
-require('should');
-
-program
-  .version('0.0.1')
-  .option('-p, --pepper', 'add pepper')
-  .option('-c, --no-cheese', 'remove cheese');
-
-program.parse(['node', 'test', '-p', '-c']);
-program.pepper.should.be.true();
-program.cheese.should.be.false();
diff --git a/test/test.options.camelcase.js b/test/test.options.camelcase.js
deleted file mode 100644
index 2542a7ed9..000000000
--- a/test/test.options.camelcase.js
+++ /dev/null
@@ -1,27 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-function parseRange(str) {
-  return str.split('..').map(Number);
-}
-
-program
-  .version('0.0.1')
-  .option('-i, --my-int <n>', 'pass an int', parseInt)
-  .option('-n, --my-num <n>', 'pass a number', Number)
-  .option('-f, --my-fLOAT <n>', 'pass a float', parseFloat)
-  .option('-m, --my-very-long-float <n>', 'pass a float', parseFloat)
-  .option('-u, --my-URL-count <n>', 'pass a float', parseFloat)
-  .option('-r, --my-long-range <a..b>', 'pass a range', parseRange);
-
-program.parse('node test -i 5.5 -f 5.5 -m 6.5 -u 7.5 -n 15.99 -r 1..5'.split(' '));
-program.myInt.should.equal(5);
-program.myNum.should.equal(15.99);
-program.myFLOAT.should.equal(5.5);
-program.myVeryLongFloat.should.equal(6.5);
-program.myURLCount.should.equal(7.5);
-program.myLongRange.should.eql([1, 5]);
diff --git a/test/test.options.cflags.js b/test/test.options.cflags.js
deleted file mode 100644
index efa2e1e56..000000000
--- a/test/test.options.cflags.js
+++ /dev/null
@@ -1,22 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('-c, --cflags <cflags>', 'pass options/flags to a compiler')
-  .option('-o, --other', 'just some other option')
-  .option('-x, --xother', 'just some other option')
-  .option('-y, --yother', 'just some other option')
-  .option('-z, --zother', 'just some other option');
-
-
-program.parse(['node', 'test', '--cflags', '-DDEBUG', '-o', '-xyz']);
-program.should.have.property('cflags', '-DDEBUG');
-program.should.have.property('other');
-program.should.have.property('xother');
-program.should.have.property('yother');
-program.should.have.property('zother');
diff --git a/test/test.options.coercion.js b/test/test.options.coercion.js
deleted file mode 100644
index 95c9265bd..000000000
--- a/test/test.options.coercion.js
+++ /dev/null
@@ -1,36 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-function parseRange(str) {
-  return str.split('..').map(Number);
-}
-
-function increaseVerbosity(v, total) {
-  return total + 1;
-}
-
-function collectValues(str, memo) {
-  memo.push(str);
-  return memo;
-}
-
-program
-  .version('0.0.1')
-  .option('-i, --int <n>', 'pass an int', parseInt)
-  .option('-n, --num <n>', 'pass a number', Number)
-  .option('-f, --float <n>', 'pass a float', parseFloat)
-  .option('-r, --range <a..b>', 'pass a range', parseRange)
-  .option('-v, --verbose', 'increase verbosity', increaseVerbosity, 0)
-  .option('-c, --collect <str>', 'add a string (can be used multiple times)', collectValues, []);
-
-program.parse('node test -i 5.5 -f 5.5 -n 15.99 -r 1..5 -c foo -c bar -c baz -vvvv --verbose'.split(' '));
-program.int.should.equal(5);
-program.num.should.equal(15.99);
-program.float.should.equal(5.5);
-program.range.should.eql([1, 5]);
-program.collect.should.eql(['foo', 'bar', 'baz']);
-program.verbose.should.equal(5);
diff --git a/test/test.options.commands.js b/test/test.options.commands.js
deleted file mode 100644
index c33d093c0..000000000
--- a/test/test.options.commands.js
+++ /dev/null
@@ -1,125 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('-C, --chdir <path>', 'change the working directory')
-  .option('-c, --config <path>', 'set config path. defaults to ./deploy.conf')
-  .option('-T, --no-tests', 'ignore test hook')
-
-var envValue = "";
-var cmdValue = "";
-var customHelp = false;
-
-program
-  .command('setup [env]')
-  .description('run setup commands for all envs')
-  .option("-s, --setup_mode [mode]", "Which setup mode to use")
-  .option("-o, --host [host]", "Host to use")
-  .action(function (env, options) {
-    var mode = options.setup_mode || "normal";
-    env = env || 'all';
-
-    envValue = env;
-  });
-
-program
-  .command('exec <cmd>')
-  .alias('ex')
-  .description('execute the given remote cmd')
-  .option("-e, --exec_mode <mode>", "Which exec mode to use")
-  .option("-t, --target [target]", "Target to use")
-  .action(function (cmd, options) {
-    cmdValue = cmd;
-  }).on("--help", function () {
-    customHelp = true;
-  });
-
-program
-  .command('*')
-  .action(function (env) {
-    console.log('deploying "%s"', env);
-  });
-
-program.parse(['node', 'test', '--config', 'conf']);
-program.config.should.equal("conf");
-program.commands[0].should.not.have.property('setup_mode');
-program.commands[1].should.not.have.property('exec_mode');
-envValue.should.equal("");
-cmdValue.should.equal("");
-
-program.parse(['node', 'test', '--config', 'conf1', 'setup', '--setup_mode', 'mode2', 'env1']);
-program.config.should.equal("conf1");
-program.commands[0].setup_mode.should.equal("mode2");
-program.commands[0].should.not.have.property('host');
-envValue.should.equal("env1");
-
-program.parse(['node', 'test', '--config', 'conf2', 'setup', '--setup_mode', 'mode3', '-o', 'host1', 'env2']);
-program.config.should.equal("conf2");
-program.commands[0].setup_mode.should.equal("mode3");
-program.commands[0].host.should.equal("host1");
-envValue.should.equal("env2");
-
-program.parse(['node', 'test', '--config', 'conf3', 'setup', '-s', 'mode4', 'env3']);
-program.config.should.equal("conf3");
-program.commands[0].setup_mode.should.equal("mode4");
-envValue.should.equal("env3");
-
-program.parse(['node', 'test', '--config', 'conf4', 'exec', '--exec_mode', 'mode1', 'exec1']);
-program.config.should.equal("conf4");
-program.commands[1].exec_mode.should.equal("mode1");
-program.commands[1].should.not.have.property('target');
-cmdValue.should.equal("exec1");
-
-program.parse(['node', 'test', '--config', 'conf5', 'exec', '-e', 'mode2', 'exec2']);
-program.config.should.equal("conf5");
-program.commands[1].exec_mode.should.equal("mode2");
-cmdValue.should.equal("exec2");
-
-program.parse(['node', 'test', '--config', 'conf6', 'exec', '--target', 'target1', '-e', 'mode6', 'exec3']);
-program.config.should.equal("conf6");
-program.commands[1].exec_mode.should.equal("mode6");
-program.commands[1].target.should.equal("target1");
-cmdValue.should.equal("exec3");
-
-delete program.commands[1].target;
-program.parse(['node', 'test', '--config', 'conf7', 'ex', '-e', 'mode3', 'exec4']);
-program.config.should.equal("conf7");
-program.commands[1].exec_mode.should.equal("mode3");
-program.commands[1].should.not.have.property('target');
-cmdValue.should.equal("exec4");
-
-// Make sure we still catch errors with required values for options
-var exceptionOccurred = false;
-var oldProcessExit = process.exit;
-var oldConsoleError = console.error;
-process.exit = function () {
-  exceptionOccurred = true;
-  throw new Error();
-};
-console.error = function () {
-};
-
-var oldProcessStdoutWrite = process.stdout.write;
-process.stdout.write = function () {
-};
-try {
-  program.parse(['node', 'test', '--config', 'conf6', 'exec', '--help']);
-} catch (ex) {
-  program.config.should.equal("conf6");
-}
-process.stdout.write = oldProcessStdoutWrite;
-
-try {
-  program.parse(['node', 'test', '--config', 'conf', 'exec', '-t', 'target1', 'exec1', '-e']);
-}
-catch (ex) {
-}
-
-process.exit = oldProcessExit;
-exceptionOccurred.should.be.true();
-customHelp.should.be.true();
diff --git a/test/test.options.defaults.given.js b/test/test.options.defaults.given.js
deleted file mode 100644
index b9bf46c10..000000000
--- a/test/test.options.defaults.given.js
+++ /dev/null
@@ -1,22 +0,0 @@
-const program = require('../');
-require('should');
-
-program
-  .option('-a, --anchovies', 'Add anchovies?')
-  .option('-o, --onions', 'Add onions?', true)
-  .option('-O, --no-onions', 'No onions')
-  .option('-t, --tomatoes', 'Add tomatoes?', false)
-  .option('-T, --no-tomatoes', 'No tomatoes')
-  .option('-v, --olives', 'Add olives? Sorry we only have black.', 'black')
-  .option('-s, --no-sauce', 'Uh… okay')
-  .option('-r, --crust <type>', 'What kind of crust would you like?', 'hand-tossed')
-  .option('-c, --cheese [type]', 'optionally specify the type of cheese', 'mozzarella');
-
-program.parse(['node', 'test', '--anchovies', '--no-onions', '--tomatoes', '--olives', '--no-sauce', '--crust', 'thin', '--cheese', 'wensleydale']);
-program.should.have.property('anchovies', true);
-program.should.have.property('onions', false);
-program.should.have.property('tomatoes', true);
-program.should.have.property('olives', 'black');
-program.should.have.property('sauce', false);
-program.should.have.property('crust', 'thin');
-program.should.have.property('cheese', 'wensleydale');
diff --git a/test/test.options.defaults.js b/test/test.options.defaults.js
deleted file mode 100644
index 54b72fc40..000000000
--- a/test/test.options.defaults.js
+++ /dev/null
@@ -1,23 +0,0 @@
-const program = require('../');
-require('should');
-
-program
-  .option('-a, --anchovies', 'Add anchovies?')
-  .option('-o, --onions', 'Add onions?', true)
-  .option('-O, --no-onions', 'No onions')
-  .option('-t, --tomatoes', 'Add tomatoes?', false)
-  .option('-T, --no-tomatoes', 'No tomatoes')
-  .option('-v, --olives', 'Add olives? Sorry we only have black.', 'black')
-  .option('-s, --no-sauce', 'Uh… okay')
-  .option('-r, --crust <type>', 'What kind of crust would you like?', 'hand-tossed')
-  .option('-c, --cheese [type]', 'optionally specify the type of cheese', 'mozzarella');
-
-program.parse(['node', 'test']);
-
-program.should.not.have.property('anchovies');
-program.should.have.property('onions', true);
-program.should.have.property('tomatoes', false);
-program.should.not.have.property('olives');
-program.should.have.property('sauce', true);
-program.should.have.property('crust', 'hand-tossed');
-program.should.have.property('cheese', 'mozzarella');
diff --git a/test/test.options.defaults.no.js b/test/test.options.defaults.no.js
deleted file mode 100644
index 3eb38d4d8..000000000
--- a/test/test.options.defaults.no.js
+++ /dev/null
@@ -1,23 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('-p, --pepper [type]', 'add pepper', 'red')
-  .option('-P, --no-pepper', 'remove pepper');
-
-program.parse(['node', 'test']);
-program.pepper.should.equal('red');
-
-program.parse(['node', 'test', '--pepper']);
-program.pepper.should.equal('red');
-
-program.parse(['node', 'test', '--pepper', 'jalapeño']);
-program.pepper.should.equal('jalapeño');
-
-program.parse(['node', 'test', '--no-pepper']);
-program.pepper.should.be.false();
diff --git a/test/test.options.equals.js b/test/test.options.equals.js
deleted file mode 100644
index 381013cfe..000000000
--- a/test/test.options.equals.js
+++ /dev/null
@@ -1,17 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('--string <n>', 'pass a string')
-  .option('--string2 <n>', 'pass another string')
-  .option('--num <n>', 'pass a number', Number)
-
-program.parse('node test --string=Hello --string2 Hello=World --num=5.5'.split(' '));
-program.string.should.equal('Hello');
-program.string2.should.equal('Hello=World');
-program.num.should.equal(5.5);
diff --git a/test/test.options.func.js b/test/test.options.func.js
deleted file mode 100644
index eb8c3bd07..000000000
--- a/test/test.options.func.js
+++ /dev/null
@@ -1,23 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .description('sdfdsfsfsdfdsf')
-  .option('-f, --foo', 'add some foo')
-  .option('-b, --bar', 'add some bar')
-  .option('-M, --no-magic', 'disable magic')
-  .option('-c, --camel-case', 'convert to camelCase')
-  .option('-q, --quux <quux>', 'add some quux');
-
-program.parse(['node', 'test', '--foo', '--bar', '--no-magic', '--camel-case', '--quux', 'value']);
-program.opts.should.be.a.Function();
-
-var opts = program.opts();
-opts.should.be.an.Object();
-opts.version.should.equal('0.0.1');
-opts.foo.should.be.true();
-opts.bar.should.be.true();
-opts.magic.should.be.false();
-opts.camelCase.should.be.true();
-opts.quux.should.equal('value');
diff --git a/test/test.options.hyphen.js b/test/test.options.hyphen.js
deleted file mode 100644
index 7fcc25578..000000000
--- a/test/test.options.hyphen.js
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('-a, --alpha <a>', 'hyphen')
-  .option('-b, --bravo <b>', 'hyphen')
-  .option('-c, --charlie <c>', 'hyphen')
-
-program.parse('node test -a - --bravo - --charlie=- - -- - -t1'.split(' '));
-program.alpha.should.equal('-');
-program.bravo.should.equal('-');
-program.charlie.should.equal('-');
-program.args[0].should.equal('-');
-program.args[1].should.equal('-');
-program.args[2].should.equal('-t1');
diff --git a/test/test.options.large-only-with-value.js b/test/test.options.large-only-with-value.js
deleted file mode 100644
index dfd524712..000000000
--- a/test/test.options.large-only-with-value.js
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('--longflag [value]', 'A long only flag with a value');
-
-program.parse(['node', 'test', '--longflag', 'something']);
-program.longflag.should.equal('something');
diff --git a/test/test.options.large-only.js b/test/test.options.large-only.js
deleted file mode 100644
index 4f07ed9d8..000000000
--- a/test/test.options.large-only.js
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .version('0.0.1')
-  .option('--verbose', 'do stuff');
-
-program.parse(['node', 'test', '--verbose']);
-program.verbose.should.be.true();
diff --git a/test/test.options.regex.js b/test/test.options.regex.js
deleted file mode 100644
index 5bc3f6a35..000000000
--- a/test/test.options.regex.js
+++ /dev/null
@@ -1,16 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-
-program
-  .version('0.0.1')
-  .option('-s, --size <size>', 'Pizza Size', /^(large|medium|small)$/i, 'medium')
-  .option('-d, --drink [drink]', 'Drink', /^(Coke|Pepsi|Izze)$/i)
-
-program.parse('node test -s big -d coke'.split(' '));
-program.size.should.equal('medium');
-program.drink.should.equal('coke');
diff --git a/test/test.options.short.adjacent-value.js b/test/test.options.short.adjacent-value.js
deleted file mode 100644
index 17e118e5e..000000000
--- a/test/test.options.short.adjacent-value.js
+++ /dev/null
@@ -1,18 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-program
-  .option('-c <required>', 'required with adjacent value')
-  .option('-q <required>', 'required with separated value')
-  .option('-o [optional]', 'optional with adjacent value')
-  .option('-p [optional]', 'optional with separated value')
-  .option('-n [optional]', 'optional without value in the middle')
-  .option('-r [optional]', 'optional without value in the end');
-
-program.parse(['node', 'test', '-c22', '-q', '33', '-o44', '-n', '-p', '55', '-r']);
-program.C.should.equal('22');
-program.Q.should.equal('33');
-program.O.should.equal('44');
-program.N.should.equal(true);
-program.P.should.equal('55');
-program.R.should.equal(true);
diff --git a/test/test.options.subcommand-hyphen.js b/test/test.options.subcommand-hyphen.js
deleted file mode 100644
index 14d9276cf..000000000
--- a/test/test.options.subcommand-hyphen.js
+++ /dev/null
@@ -1,21 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should');
-
-program
-  .command('subcommand')
-  .description('description')
-  .option('-a, --alpha <a>', 'hyphen')
-  .option('-b, --bravo <b>', 'hyphen')
-  .option('-c, --charlie <c>', 'hyphen')
-  .action(function (options) {
-  });
-
-program.parse('node test subcommand -a - --bravo - --charlie=-'.split(' '));
-
-program.commands[0].alpha.should.equal('-');
-program.commands[0].bravo.should.equal('-');
-program.commands[0].charlie.should.equal('-');
diff --git a/test/test.options.version.custom.js b/test/test.options.version.custom.js
deleted file mode 100644
index 9b7d256f8..000000000
--- a/test/test.options.version.custom.js
+++ /dev/null
@@ -1,20 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-var capturedExitCode, capturedOutput, oldProcessExit, oldProcessStdoutWrite;
-
-program.version('0.0.1', '-r, --revision');
-
-['-r', '--revision'].forEach(function (flag) {
-  capturedExitCode = -1;
-  capturedOutput = '';
-  oldProcessExit = process.exit;
-  oldProcessStdoutWrite = process.stdout.write;
-  process.exit = function (code) { capturedExitCode = code; }
-  process.stdout.write = function(output) { capturedOutput += output; }
-  program.parse(['node', 'test', flag]);
-  process.exit = oldProcessExit;
-  process.stdout.write = oldProcessStdoutWrite;
-  capturedOutput.should.equal('0.0.1\n');
-  capturedExitCode.should.equal(0);
-})
diff --git a/test/test.options.version.customHelpDescription.js b/test/test.options.version.customHelpDescription.js
deleted file mode 100644
index 7471e7310..000000000
--- a/test/test.options.version.customHelpDescription.js
+++ /dev/null
@@ -1,22 +0,0 @@
-var program = require('../')
-  , sinon = require('sinon').sandbox.create()
-  , should = require('should');
-
-program.version('1.0.0', undefined, 'custom version output');
-program.command('somecommand');
-program.command('anothercommand [options]');
-
-var expectedHelpInformation = [
-  'Usage:  [options] [command]',
-  '',
-  'Options:',
-  '  -V, --version             custom version output',
-  '  -h, --help                output usage information',
-  '',
-  'Commands:',
-  '  somecommand',
-  '  anothercommand [options]',
-  ''
-].join('\n');
-
-program.helpInformation().should.equal(expectedHelpInformation);
diff --git a/test/test.options.version.js b/test/test.options.version.js
deleted file mode 100644
index ae25e84fe..000000000
--- a/test/test.options.version.js
+++ /dev/null
@@ -1,20 +0,0 @@
-var program = require('../')
-  , should = require('should');
-
-var capturedExitCode, capturedOutput, oldProcessExit, oldProcessStdoutWrite;
-
-program.version('0.0.1');
-
-['-V', '--version'].forEach(function (flag) {
-  capturedExitCode = -1;
-  capturedOutput = '';
-  oldProcessExit = process.exit;
-  oldProcessStdoutWrite = process.stdout.write;
-  process.exit = function (code) { capturedExitCode = code; }
-  process.stdout.write = function(output) { capturedOutput += output; }
-  program.parse(['node', 'test', flag]);
-  process.exit = oldProcessExit;
-  process.stdout.write = oldProcessStdoutWrite;
-  capturedOutput.should.equal('0.0.1\n');
-  capturedExitCode.should.equal(0);
-})
diff --git a/test/test.variadic.args.js b/test/test.variadic.args.js
deleted file mode 100644
index f8e1b0fc8..000000000
--- a/test/test.variadic.args.js
+++ /dev/null
@@ -1,60 +0,0 @@
-/**
- * Module dependencies.
- */
-
-var program = require('../')
-  , should = require('should')
-  , util = require('util')
-  , programArgs = ['node', 'test', 'mycommand', 'arg0', 'arg1', 'arg2', 'arg3']
-  , requiredArg
-  , variadicArg;
-
-program
-  .version('0.0.1')
-  .command('mycommand <id> [variadicArg...]')
-  .action(function (arg0, arg1) {
-    requiredArg = arg0;
-    variadicArg = arg1;
-  });
-
-program.parse(programArgs);
-
-requiredArg.should.eql('arg0');
-variadicArg.should.eql(['arg1', 'arg2', 'arg3']);
-
-program.args.should.have.lengthOf(3);
-program.args[0].should.eql('arg0');
-program.args[1].should.eql(['arg1', 'arg2', 'arg3']);
-
-program
-  .version('0.0.1')
-  .command('mycommand <variadicArg...> [optionalArg]')
-  .action(function (arg0, arg1) {
-
-  });
-
-// Make sure we still catch errors with required values for options
-var consoleErrors = [];
-var oldProcessExit = process.exit;
-var oldConsoleError = console.error;
-var errorMessage;
-
-process.exit = function () {
-  throw new Error(consoleErrors.join('\n'));
-};
-console.error = function () {
-  consoleErrors.push(util.format.apply(util, arguments));
-};
-
-try {
-  program.parse(programArgs);
-
-  should.fail(null, null, 'An Error should had been thrown above');
-} catch (err) {
-  errorMessage = err.message;
-}
-
-process.exit = oldProcessExit;
-console.error = oldConsoleError;
-
-'error: variadic arguments must be last \'variadicArg\''.should.eql(errorMessage);
diff --git a/tests/args.literal.test.js b/tests/args.literal.test.js
new file mode 100644
index 000000000..75721d46b
--- /dev/null
+++ b/tests/args.literal.test.js
@@ -0,0 +1,27 @@
+const commander = require('../');
+
+// Guideline 10:
+// The first -- argument that is not an option-argument should be accepted as a delimiter indicating the end of options. Any following arguments should be treated as operands, even if they begin with the '-' character.
+//
+// http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html#tag_12_02
+
+test('when arguments includes -- then stop processing options', () => {
+  const program = new commander.Command();
+  program
+    .option('-f, --foo', 'add some foo')
+    .option('-b, --bar', 'add some bar');
+  program.parse(['node', 'test', '--foo', '--', '--bar', 'baz']);
+  // More than one assert, ported from legacy test
+  expect(program.foo).toBe(true);
+  expect(program.bar).toBeUndefined();
+  expect(program.args).toEqual(['--bar', 'baz']);
+});
+
+test('when arguments include -- then more literals are passed-through as args', () => {
+  const program = new commander.Command();
+  program
+    .option('-f, --foo', 'add some foo')
+    .option('-b, --bar', 'add some bar');
+  program.parse(['node', 'test', '--', 'cmd', '--', '--arg']);
+  expect(program.args).toEqual(['cmd', '--', '--arg']);
+});
diff --git a/tests/args.variadic.test.js b/tests/args.variadic.test.js
new file mode 100644
index 000000000..cf011381c
--- /dev/null
+++ b/tests/args.variadic.test.js
@@ -0,0 +1,94 @@
+const commander = require('../');
+
+// Testing variadic arguments. Testing all the action arguments, but could test just variadicArg.
+
+describe('.version', () => {
+  // Optional. Use internal knowledge to suppress output to keep test output clean.
+  let consoleErrorSpy;
+
+  beforeAll(() => {
+    consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => { });
+  });
+
+  afterEach(() => {
+    consoleErrorSpy.mockClear();
+  });
+
+  afterAll(() => {
+    consoleErrorSpy.mockRestore();
+  });
+
+  test('when no extra arguments specified for program then variadic arg is empty array', () => {
+    const actionMock = jest.fn();
+    const program = new commander.Command();
+    program
+      .arguments('<id> [variadicArg...]')
+      .action(actionMock);
+
+    program.parse(['node', 'test', 'id']);
+
+    expect(actionMock).toHaveBeenCalledWith('id', [], program);
+  });
+
+  test('when extra arguments specified for program then variadic arg is array of values', () => {
+    const actionMock = jest.fn();
+    const program = new commander.Command();
+    program
+      .arguments('<id> [variadicArg...]')
+      .action(actionMock);
+    const extraArguments = ['a', 'b', 'c'];
+
+    program.parse(['node', 'test', 'id', ...extraArguments]);
+
+    expect(actionMock).toHaveBeenCalledWith('id', extraArguments, program);
+  });
+
+  test('when no extra arguments specified for command then variadic arg is empty array', () => {
+    const actionMock = jest.fn();
+    const program = new commander.Command();
+    const cmd = program
+      .command('sub [variadicArg...]')
+      .action(actionMock);
+
+    program.parse(['node', 'test', 'sub']);
+
+    expect(actionMock).toHaveBeenCalledWith([], cmd);
+  });
+
+  test('when extra arguments specified for command then variadic arg is array of values', () => {
+    const actionMock = jest.fn();
+    const program = new commander.Command();
+    const cmd = program
+      .command('sub [variadicArg...]')
+      .action(actionMock);
+    const extraArguments = ['a', 'b', 'c'];
+
+    program.parse(['node', 'test', 'sub', ...extraArguments]);
+
+    expect(actionMock).toHaveBeenCalledWith(extraArguments, cmd);
+  });
+
+  test('when program variadic argument not last then error', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .arguments('<variadicArg...> [optionalArg]')
+      .action(jest.fn);
+
+    expect(() => {
+      program.parse(['node', 'test', 'a']);
+    }).toThrow(`error: variadic arguments must be last 'variadicArg'`);
+  });
+
+  test('when command variadic argument not last then error', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .command('sub <variadicArg...> [optionalArg]')
+      .action(jest.fn);
+
+    expect(() => {
+      program.parse(['node', 'test', 'sub', 'a']);
+    }).toThrow(`error: variadic arguments must be last 'variadicArg'`);
+  });
+});
diff --git a/tests/command.alias.test.js b/tests/command.alias.test.js
new file mode 100644
index 000000000..f5577905a
--- /dev/null
+++ b/tests/command.alias.test.js
@@ -0,0 +1,22 @@
+const commander = require('../');
+
+// Running alias commands is tested in command.executableSubcommand.lookup.test.js
+// Test various other behaviours for .alias
+
+test('when command has alias then appears in help', () => {
+  const program = new commander.Command();
+  program
+    .command('info [thing]')
+    .alias('i');
+  const helpInformation = program.helpInformation();
+  expect(helpInformation).toMatch('info|i');
+});
+
+test('when command = alias then error', () => {
+  const program = new commander.Command();
+  expect(() => {
+    program
+      .command('fail')
+      .alias('fail');
+  }).toThrow("Command alias can't be the same as its name");
+});
diff --git a/tests/command.allowUnknownOptions.test.js b/tests/command.allowUnknownOptions.test.js
new file mode 100644
index 000000000..d6353d4bb
--- /dev/null
+++ b/tests/command.allowUnknownOptions.test.js
@@ -0,0 +1,70 @@
+const commander = require('../');
+
+// Not testing output, just testing whether an error is detected.
+
+describe('.version', () => {
+  // Optional. Use internal knowledge to suppress output to keep test output clean.
+  let consoleErrorSpy;
+
+  beforeAll(() => {
+    consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => { });
+  });
+
+  afterEach(() => {
+    consoleErrorSpy.mockClear();
+  });
+
+  afterAll(() => {
+    consoleErrorSpy.mockRestore();
+  });
+
+  test('when specify unknown program option then error', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .option('-p, --pepper', 'add pepper');
+
+    expect(() => {
+      program.parse(['node', 'test', '-m']);
+    }).toThrow();
+  });
+
+  test('when specify unknown program option and allowUnknownOption then no error', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .allowUnknownOption()
+      .option('-p, --pepper', 'add pepper');
+
+    expect(() => {
+      program.parse(['node', 'test', '-m']);
+    }).not.toThrow();
+  });
+
+  test('when specify unknown command option then error', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .command('sub')
+      .option('-p, --pepper', 'add pepper')
+      .action(() => { });
+
+    expect(() => {
+      program.parse(['node', 'test', 'sub', '-m']);
+    }).toThrow();
+  });
+
+  test('when specify unknown command option and allowUnknownOption then no error', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .command('sub')
+      .allowUnknownOption()
+      .option('-p, --pepper', 'add pepper')
+      .action(() => { });
+
+    expect(() => {
+      program.parse(['node', 'test', 'sub', '-m']);
+    }).not.toThrow();
+  });
+});
diff --git a/tests/command.asterisk.test.js b/tests/command.asterisk.test.js
new file mode 100644
index 000000000..44a8690f2
--- /dev/null
+++ b/tests/command.asterisk.test.js
@@ -0,0 +1,34 @@
+const commander = require('../');
+
+test('when no arguments then asterisk action not called', () => {
+  const mockAction = jest.fn();
+  const program = new commander.Command();
+  program
+    .command('install')
+    .action(mockAction);
+  program.parse(['node', 'test']);
+  expect(mockAction).not.toHaveBeenCalled();
+});
+
+test('when recognised command then asterisk action not called', () => {
+  const mockAction = jest.fn();
+  const program = new commander.Command();
+  program
+    .command('install')
+    .action(() => { });
+  program
+    .action(mockAction);
+  program.parse(['node', 'test', 'install']);
+  expect(mockAction).not.toHaveBeenCalled();
+});
+
+test('when unrecognised command/argument then asterisk action called', () => {
+  const mockAction = jest.fn();
+  const program = new commander.Command();
+  program
+    .command('install');
+  program
+    .action(mockAction);
+  program.parse(['node', 'test', 'unrecognised-command']);
+  expect(mockAction).toHaveBeenCalled();
+});
diff --git a/tests/command.commandHelp.test.js b/tests/command.commandHelp.test.js
new file mode 100644
index 000000000..57428ce53
--- /dev/null
+++ b/tests/command.commandHelp.test.js
@@ -0,0 +1,19 @@
+const commander = require('../');
+
+// Note: .commandHelp is not currently documented in the README. This is a ported legacy test.
+
+test('when program has command then appears in commandHelp', () => {
+  const program = new commander.Command();
+  program
+    .command('bare');
+  const commandHelp = program.commandHelp();
+  expect(commandHelp).toBe('Commands:\n  bare\n');
+});
+
+test('when program has command with optional arg then appears in commandHelp', () => {
+  const program = new commander.Command();
+  program
+    .command('bare [bare-arg]');
+  const commandHelp = program.commandHelp();
+  expect(commandHelp).toEqual('Commands:\n  bare [bare-arg]\n');
+});
diff --git a/tests/command.executableSubcommand.default.test.js b/tests/command.executableSubcommand.default.test.js
new file mode 100644
index 000000000..867a660df
--- /dev/null
+++ b/tests/command.executableSubcommand.default.test.js
@@ -0,0 +1,18 @@
+const childProcess = require('child_process');
+const path = require('path');
+
+const bin = path.join(__dirname, './fixtures/pm');
+
+test('when default subcommand and no command then call default', (done) => {
+  childProcess.execFile(bin, [], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('default\n');
+    done();
+  });
+});
+
+test('when default subcommand and unrecognised argument then call default', (done) => {
+  childProcess.execFile(bin, ['unrecognised-argument'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('default\n');
+    done();
+  });
+});
diff --git a/tests/command.executableSubcommand.inspect.test.js b/tests/command.executableSubcommand.inspect.test.js
new file mode 100644
index 000000000..518e2365d
--- /dev/null
+++ b/tests/command.executableSubcommand.inspect.test.js
@@ -0,0 +1,69 @@
+const childProcess = require('child_process');
+const path = require('path');
+
+// Test the special handling for --inspect to increment fixed debug port numbers.
+// If we reuse port we can get conflicts because port not released fast enough.
+
+const inspectCommand = path.join(__dirname, './fixtures', 'inspect.js');
+
+test('when execArgv empty then spawn execArgs empty', (done) => {
+  childProcess.execFile('node', [inspectCommand, 'sub'], function(_error, stdout, stderr) {
+    expect(stdout).toBe('[]\n');
+    done();
+  });
+});
+
+test('when execArgv --harmony then spawn execArgs --harmony', (done) => {
+  childProcess.execFile('node', ['--harmony', inspectCommand, 'sub'], function(_error, stdout, stderr) {
+    expect(stdout).toBe("[ '--harmony' ]\n");
+    done();
+  });
+});
+
+// --inspect defaults to 127.0.0.1:9229, port should be incremented
+test('when execArgv --inspect then spawn execArgs using port 9230', (done) => {
+  childProcess.execFile('node', ['--inspect', inspectCommand, 'sub'], function(_error, stdout, stderr) {
+    expect(stdout).toBe("[ '--inspect=127.0.0.1:9230' ]\n");
+    done();
+  });
+});
+
+// custom port
+test('when execArgv --inspect=9240 then spawn execArgs using port 9241', (done) => {
+  childProcess.execFile('node', ['--inspect=9240', inspectCommand, 'sub'], function(_error, stdout, stderr) {
+    expect(stdout).toBe("[ '--inspect=127.0.0.1:9241' ]\n");
+    done();
+  });
+});
+
+// zero is special, random port
+test('when execArgv --inspect=0 then spawn execArgs --inspect=0', (done) => {
+  childProcess.execFile('node', ['--inspect=0', inspectCommand, 'sub'], function(_error, stdout, stderr) {
+    expect(stdout).toBe("[ '--inspect=0' ]\n");
+    done();
+  });
+});
+
+// ip address
+test('when execArgv --inspect=127.0.0.1:9250 then spawn execArgs --inspect=127.0.0.1:9251', (done) => {
+  childProcess.execFile('node', ['--inspect=127.0.0.1:9250', inspectCommand, 'sub'], function(_error, stdout, stderr) {
+    expect(stdout).toBe("[ '--inspect=127.0.0.1:9251' ]\n");
+    done();
+  });
+});
+
+// localhost
+test('when execArgv --inspect=localhost:9260 then spawn execArgs --inspect=localhost:9261', (done) => {
+  childProcess.execFile('node', ['--inspect=localhost:9260', inspectCommand, 'sub'], function(_error, stdout, stderr) {
+    expect(stdout).toBe("[ '--inspect=localhost:9261' ]\n");
+    done();
+  });
+});
+
+// --inspect-port, just test most likely format
+test('when execArgv --inspect-port=9270 then spawn execArgs --inspect-port=127.0.0.1:9271', (done) => {
+  childProcess.execFile('node', ['--inspect-port=9270', inspectCommand, 'sub'], function(_error, stdout, stderr) {
+    expect(stdout).toBe("[ '--inspect-port=127.0.0.1:9271' ]\n");
+    done();
+  });
+});
diff --git a/tests/command.executableSubcommand.lookup.test.js b/tests/command.executableSubcommand.lookup.test.js
new file mode 100644
index 000000000..ee6e4245b
--- /dev/null
+++ b/tests/command.executableSubcommand.lookup.test.js
@@ -0,0 +1,103 @@
+const childProcess = require('child_process');
+const path = require('path');
+
+const bin = path.join(__dirname, './fixtures/pm');
+
+test('when subcommand file missing then error', (done) => {
+  childProcess.execFile(bin, ['list'], function(_error, stdout, stderr) {
+    expect(stderr).toBe('error: pm-list(1) does not exist, try --help\n');
+    done();
+  });
+});
+
+test('when alias subcommand file missing then error', (done) => {
+  childProcess.execFile(bin, ['lst'], function(_error, stdout, stderr) {
+    expect(stderr).toBe('error: pm-list(1) does not exist, try --help\n');
+    done();
+  });
+});
+
+test('when subcommand file has no suffix then lookup succeeds', (done) => {
+  childProcess.execFile(bin, ['install'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('install\n');
+    done();
+  });
+});
+
+test('when alias subcommand file has no suffix then lookup succeeds', (done) => {
+  childProcess.execFile(bin, ['i'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('install\n');
+    done();
+  });
+});
+
+test('when subcommand target executablefile has no suffix then lookup succeeds', (done) => {
+  childProcess.execFile(bin, ['specifyInstall'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('install\n');
+    done();
+  });
+});
+
+test('when subcommand file suffix .js then lookup succeeds', (done) => {
+  childProcess.execFile(bin, ['publish'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('publish\n');
+    done();
+  });
+});
+
+test('when alias subcommand file suffix .js then lookup succeeds', (done) => {
+  childProcess.execFile(bin, ['p'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('publish\n');
+    done();
+  });
+});
+
+test('when subcommand target executablefile has suffix .js then lookup succeeds', (done) => {
+  childProcess.execFile(bin, ['specifyPublish'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('publish\n');
+    done();
+  });
+});
+
+// This is not a behaviour we enforce but rather one that is expected.
+test('when subcommand file not executable then error', (done) => {
+  childProcess.execFile(bin, ['search'], { }, function(error, stdout, stderr) {
+    // In node 8 the EACCES gets thrown instead of emitted through the spawned process.
+    // In node 10 and 12 we get the commander error.
+    // commander: error: %s(1) not executable. try chmod or run with root
+    // node: Error: Command failed: ... Error: spawn EACCES
+    expect(error.toString()).toMatch(new RegExp('not executable|EACCES'));
+    done();
+  });
+});
+
+test('when subcommand file is symlink then lookup succeeds', (done) => {
+  const binLink = path.join(__dirname, './fixtures/pmlink');
+  childProcess.execFile(binLink, ['install'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('install\n');
+    done();
+  });
+});
+
+test('when subcommand file is double symlink then lookup succeeds', (done) => {
+  const binLink = path.join(__dirname, './fixtures/another-dir/pm');
+  childProcess.execFile(binLink, ['install'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('install\n');
+    done();
+  });
+});
+
+test('when subcommand suffix is .ts then lookup succeeds', (done) => {
+  const binLinkTs = path.join(__dirname, './fixtures-ts/pm.ts');
+  childProcess.execFile('node', ['-r', 'ts-node/register', binLinkTs, 'install'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('install\n');
+    done();
+  });
+});
+
+test('when subsubcommand then lookup sub-sub-command', (done) => {
+  childProcess.execFile(bin, ['cache', 'clear'], { }, function(_error, stdout, stderr) {
+    expect(stdout).toBe('cache-clear\n');
+    done();
+  });
+});
diff --git a/tests/command.executableSubcommand.signals.test.js b/tests/command.executableSubcommand.signals.test.js
new file mode 100644
index 000000000..83e823adc
--- /dev/null
+++ b/tests/command.executableSubcommand.signals.test.js
@@ -0,0 +1,32 @@
+const childProcess = require('child_process');
+const path = require('path');
+
+// Test that a signal sent to the parent process is received by the executable subcommand process (which is listening)
+
+// Note: the previous (sinon) test had custom code for SIGUSR1, revist if required:
+//    As described at https://nodejs.org/api/process.html#process_signal_events
+//    this signal will start a debugger and thus the process might output an
+//    additional error message:
+//      "Failed to open socket on port 5858, waiting 1000 ms before retrying".
+
+describe.each([['SIGINT'], ['SIGHUP'], ['SIGTERM'], ['SIGUSR1'], ['SIGUSR2']])(
+  'test signal handling in executableSubcommand', (value) => {
+    test(`when command killed with ${value} then executableSubcommand receieves ${value}`, (done) => {
+      const pmPath = path.join(__dirname, './fixtures/pm');
+
+      // The child process writes to stdout.
+      var proc = childProcess.spawn(pmPath, ['listen'], {});
+
+      let processOutput = '';
+      proc.stdout.on('data', (data) => {
+        if (processOutput.length === 0) {
+          proc.kill(`${value}`);
+        }
+        processOutput += data.toString();
+      });
+      proc.on('close', (code) => {
+        expect(processOutput).toBe(`Listening for signal...${value}`);
+        done();
+      });
+    });
+  });
diff --git a/tests/command.executableSubcommand.test.js b/tests/command.executableSubcommand.test.js
new file mode 100644
index 000000000..f97529956
--- /dev/null
+++ b/tests/command.executableSubcommand.test.js
@@ -0,0 +1,17 @@
+const commander = require('../');
+
+// Executable subcommand tests that didn't fit in elsewhere.
+
+// This is the default behaviour when no default command and no action handlers
+test('when no command missing then display help', () => {
+  // Optional. Suppress normal output to keep test output clean.
+  const writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
+  const program = new commander.Command();
+  program
+    ._exitOverride((err) => { throw err; })
+    .command('install', 'install description');
+  expect(() => {
+    program.parse(['node', 'test']);
+  }).toThrow('(outputHelp)');
+  writeSpy.mockClear();
+});
diff --git a/tests/command.exitOverride.test.js b/tests/command.exitOverride.test.js
new file mode 100644
index 000000000..0df6451e9
--- /dev/null
+++ b/tests/command.exitOverride.test.js
@@ -0,0 +1,210 @@
+const commander = require('../');
+const path = require('path');
+
+// Test details of the exitOverride errors.
+// The important checks are the exitCode and code which are intended to be stable for
+// semver minor versions. For now, also testing the error.message and that output occured
+// to detect accidental changes in behaviour.
+
+function expectCommanderError(err, exitCode, code, message) {
+  expect(err).toBeInstanceOf(commander.CommanderError);
+  expect(err.exitCode).toBe(exitCode);
+  expect(err.code).toBe(code);
+  expect(err.message).toBe(message);
+}
+
+describe('.exitOverride and error details', () => {
+  // Use internal knowledge to suppress output to keep test output clean.
+  let consoleErrorSpy;
+  let writeSpy;
+
+  beforeAll(() => {
+    consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => { });
+    writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
+  });
+
+  afterEach(() => {
+    consoleErrorSpy.mockClear();
+    writeSpy.mockClear();
+  });
+
+  afterAll(() => {
+    consoleErrorSpy.mockRestore();
+    writeSpy.mockRestore();
+  });
+
+  test('when specify unknown program option then throw CommanderError', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride();
+
+    let caughtErr;
+    try {
+      program.parse(['node', 'test', '-m']);
+    } catch (err) {
+      caughtErr = err;
+    }
+
+    expect(consoleErrorSpy).toHaveBeenCalled();
+    expectCommanderError(caughtErr, 1, 'commander.unknownOption', "error: unknown option '-m'");
+  });
+
+  // Same error as above, but with custom handler.
+  test('when supply custom handler then throw custom error', () => {
+    const customError = new commander.CommanderError(123, 'custom-code', 'custom-message');
+    const program = new commander.Command();
+    program
+      ._exitOverride((_err) => {
+        throw customError;
+      });
+
+    let caughtErr;
+    try {
+      program.parse(['node', 'test', '-m']);
+    } catch (err) {
+      caughtErr = err;
+    }
+
+    expectCommanderError(caughtErr, customError.exitCode, customError.code, customError.message);
+  });
+
+  test('when specify option without required value then throw CommanderError', () => {
+    const optionFlags = '-p, --pepper <type>';
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .option(optionFlags, 'add pepper');
+
+    let caughtErr;
+    try {
+      program.parse(['node', 'test', '--pepper']);
+    } catch (err) {
+      caughtErr = err;
+    }
+
+    expect(consoleErrorSpy).toHaveBeenCalled();
+    expectCommanderError(caughtErr, 1, 'commander.optionMissingArgument', `error: option '${optionFlags}' argument missing`);
+  });
+
+  test('when specify command without required argument then throw CommanderError', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .command('compress <arg-name>')
+      .action(() => { });
+
+    let caughtErr;
+    try {
+      program.parse(['node', 'test', 'compress']);
+    } catch (err) {
+      caughtErr = err;
+    }
+
+    expect(consoleErrorSpy).toHaveBeenCalled();
+    expectCommanderError(caughtErr, 1, 'commander.missingArgument', `error: missing required argument 'arg-name'`);
+  });
+
+  test('when specify --help then throw CommanderError', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride();
+
+    let caughtErr;
+    try {
+      program.parse(['node', 'test', '--help']);
+    } catch (err) {
+      caughtErr = err;
+    }
+
+    expect(writeSpy).toHaveBeenCalled();
+    expectCommanderError(caughtErr, 0, 'commander.helpDisplayed', '(outputHelp)');
+  });
+
+  test('when executable subcommand and no command specified then throw CommanderError', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .command('compress', 'compress description');
+
+    let caughtErr;
+    try {
+      program.parse(['node', 'test']);
+    } catch (err) {
+      caughtErr = err;
+    }
+
+    // This is effectively treated as a deliberate request for help, rather than an error.
+    expect(writeSpy).toHaveBeenCalled();
+    expectCommanderError(caughtErr, 0, 'commander.helpDisplayed', '(outputHelp)');
+  });
+
+  test('when specify --version then throw CommanderError', () => {
+    const myVersion = '1.2.3';
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .version(myVersion);
+
+    let caughtErr;
+    try {
+      program.parse(['node', 'test', '--version']);
+    } catch (err) {
+      caughtErr = err;
+    }
+
+    expect(writeSpy).toHaveBeenCalled();
+    expectCommanderError(caughtErr, 0, 'commander.version', myVersion);
+  });
+
+  test('when program variadic argument not last then throw CommanderError', () => {
+    // Note: this error is notified during parse, although could have been detected at declaration.
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .arguments('<myVariadicArg...> [optionalArg]')
+      .action(jest.fn);
+
+    let caughtErr;
+    try {
+      program.parse(['node', 'test', 'a']);
+    } catch (err) {
+      caughtErr = err;
+    }
+
+    expect(consoleErrorSpy).toHaveBeenCalled();
+    expectCommanderError(caughtErr, 1, 'commander.variadicArgNotLast', "error: variadic arguments must be last 'myVariadicArg'");
+  });
+
+  test('when executableSubcommand succeeds then call exitOverride', (done) => {
+    const pm = path.join(__dirname, 'fixtures/pm');
+    const program = new commander.Command();
+    program
+      ._exitOverride((err) => {
+        expectCommanderError(err, 0, 'commander.executeSubCommandAsync', '(close)');
+        done();
+      })
+      .command('silent', 'description');
+
+    program.parse(['node', pm, 'silent']);
+  });
+
+  test('when executableSubcommand fails then call exitOverride', (done) => {
+    // Tricky for override, get called for `error` event then `exit` event.
+    const exitCallback = jest.fn()
+      .mockImplementationOnce((err) => {
+        expectCommanderError(err, 1, 'commander.executeSubCommandAsync', '(error)');
+        expect(err.nestedError.code).toBe('ENOENT');
+      })
+      .mockImplementation((err) => {
+        expectCommanderError(err, 0, 'commander.executeSubCommandAsync', '(close)');
+        done();
+      });
+    const pm = path.join(__dirname, 'fixtures/pm');
+    const program = new commander.Command();
+    program
+      ._exitOverride(exitCallback)
+      .command('does-not-exist', 'fail');
+
+    program.parse(['node', pm, 'does-not-exist']);
+  });
+});
diff --git a/tests/command.help.test.js b/tests/command.help.test.js
new file mode 100644
index 000000000..6cc7d412f
--- /dev/null
+++ b/tests/command.help.test.js
@@ -0,0 +1,96 @@
+const commander = require('../');
+
+// Testing various help incantations.
+//
+// Note there are also specific help tests included in many of the feature tests,
+// such as the alias, version, usage, name, helpOption, and commandHelp tests.
+
+// Avoid doing many full format tests as will be broken by any layout changes!
+test('when call helpInformation for program then help format is as expected (usage, options, commands)', () => {
+  const program = new commander.Command();
+  program
+    .command('my-command <file>');
+  const expectedHelpInformation =
+`Usage: test [options] [command]
+
+Options:
+  -h, --help         output usage information
+
+Commands:
+  my-command <file>
+`;
+
+  program.parse(['node', 'test']);
+  const helpInformation = program.helpInformation();
+  expect(helpInformation).toBe(expectedHelpInformation);
+});
+
+test('when use .description for command then help incudes description', () => {
+  const program = new commander.Command();
+  program
+    .command('simple-command')
+    .description('custom-description');
+  program.parse(['node', 'test']);
+  const helpInformation = program.helpInformation();
+  expect(helpInformation).toMatch(/simple-command +custom-description/);
+});
+
+test('when call .help then exit', () => {
+  // Optional. Suppress normal output to keep test output clean.
+  const writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
+  const program = new commander.Command();
+  program
+    ._exitOverride();
+  expect(() => {
+    program.help();
+  }).toThrow('(outputHelp)');
+  writeSpy.mockClear();
+});
+
+test('when specify --help then exit', () => {
+  // Optional. Suppress normal output to keep test output clean.
+  const writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
+  const program = new commander.Command();
+  program
+    ._exitOverride();
+  expect(() => {
+    program.parse(['node', 'test', '--help']);
+  }).toThrow('(outputHelp)');
+  writeSpy.mockClear();
+});
+
+test('when call help(cb) then display cb output and exit', () => {
+  // Using spy to detect custom output
+  const writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
+  const helpReplacement = 'reformatted help';
+  const program = new commander.Command();
+  program
+    ._exitOverride();
+  expect(() => {
+    program.help((helpInformation) => {
+      return helpReplacement;
+    });
+  }).toThrow('(outputHelp)');
+  expect(writeSpy).toHaveBeenCalledWith(helpReplacement);
+  writeSpy.mockClear();
+});
+
+test('when call outputHelp(cb) then display cb output', () => {
+  // Using spy to detect custom output
+  const writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
+  const helpReplacement = 'reformatted help';
+  const program = new commander.Command();
+  program.outputHelp((helpInformation) => {
+    return helpReplacement;
+  });
+  expect(writeSpy).toHaveBeenCalledWith(helpReplacement);
+  writeSpy.mockClear();
+});
+
+test('when command sets noHelp then not displayed in helpInformation', () => {
+  const program = new commander.Command();
+  program
+    .command('secret', 'secret description', { noHelp: true });
+  const helpInformation = program.helpInformation();
+  expect(helpInformation).not.toMatch('secret');
+});
diff --git a/tests/command.helpOption.test.js b/tests/command.helpOption.test.js
new file mode 100644
index 000000000..b99eaaec2
--- /dev/null
+++ b/tests/command.helpOption.test.js
@@ -0,0 +1,22 @@
+const commander = require('../');
+
+test('when helpOption has custom flags then custom flag invokes help', () => {
+  // Optional. Suppress normal output to keep test output clean.
+  const writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
+  const program = new commander.Command();
+  program
+    ._exitOverride()
+    .helpOption('--custom-help', 'custom help output');
+  expect(() => {
+    program.parse(['node', 'test', '--custom-help']);
+  }).toThrow('(outputHelp)');
+  writeSpy.mockClear();
+});
+
+test('when helpOption has custom description then helpInformation include custom description', () => {
+  const program = new commander.Command();
+  program
+    .helpOption('-C,--custom-help', 'custom help output');
+  const helpInformation = program.helpInformation();
+  expect(helpInformation).toMatch(/-C,--custom-help +custom help output/);
+});
diff --git a/tests/command.name.test.js b/tests/command.name.test.js
new file mode 100644
index 000000000..290e32ffc
--- /dev/null
+++ b/tests/command.name.test.js
@@ -0,0 +1,28 @@
+const commander = require('../');
+
+test('when set program name and parse then name is as assigned', () => {
+  const program = new commander.Command();
+  program.name('custom');
+  program.parse(['node', 'test']);
+  expect(program.name()).toBe('custom');
+});
+
+test('when program name not set and parse then name is found from arguments', () => {
+  const program = new commander.Command();
+  program.parse(['node', 'test']);
+  expect(program.name()).toBe('test');
+});
+
+test('when add command then command is named', () => {
+  const program = new commander.Command();
+  const subcommand = program
+    .command('mycommand <file>');
+  expect(subcommand.name()).toBe('mycommand');
+});
+
+test('when set program name then name appears in help', () => {
+  const program = new commander.Command();
+  program.name('custom-name');
+  const helpInformation = program.helpInformation();
+  expect(helpInformation).toMatch(/^Usage: custom-name/);
+});
diff --git a/tests/command.usage.test.js b/tests/command.usage.test.js
new file mode 100644
index 000000000..7c3616813
--- /dev/null
+++ b/tests/command.usage.test.js
@@ -0,0 +1,46 @@
+const commander = require('../');
+
+test('when default usage and check program help then starts with default usage', () => {
+  const program = new commander.Command();
+
+  program.parse(['node', 'test']);
+  const helpInformation = program.helpInformation();
+
+  expect(helpInformation).toMatch(new RegExp('^Usage: test \\[options\\]'));
+});
+
+test('when custom usage and check program help then starts with custom usage', () => {
+  const myUsage = 'custom';
+  const program = new commander.Command();
+  program
+    .usage(myUsage);
+
+  program.parse(['node', 'test']);
+  const helpInformation = program.helpInformation();
+
+  expect(helpInformation).toMatch(new RegExp(`^Usage: test ${myUsage}`));
+});
+
+test('when default usage and check subcommand help then starts with default usage including program name', () => {
+  const program = new commander.Command();
+  const subCommand = program
+    .command('info');
+
+  program.parse(['node', 'test']);
+  const helpInformation = subCommand.helpInformation();
+
+  expect(helpInformation).toMatch(new RegExp('^Usage: test info \\[options\\]'));
+});
+
+test('when custom usage and check subcommand help then starts with custom usage including program name', () => {
+  const myUsage = 'custom';
+  const program = new commander.Command();
+  const subCommand = program
+    .command('info')
+    .usage(myUsage);
+
+  program.parse(['node', 'test']);
+  const helpInformation = subCommand.helpInformation();
+
+  expect(helpInformation).toMatch(new RegExp(`^Usage: test info ${myUsage}`));
+});
diff --git a/test/fixtures-ts/pm-install.ts b/tests/fixtures-ts/pm-install.ts
similarity index 100%
rename from test/fixtures-ts/pm-install.ts
rename to tests/fixtures-ts/pm-install.ts
diff --git a/tests/fixtures-ts/pm.ts b/tests/fixtures-ts/pm.ts
new file mode 100644
index 000000000..41f8fc002
--- /dev/null
+++ b/tests/fixtures-ts/pm.ts
@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+var program = require('../../');
+
+program
+  .version('0.0.1')
+  .command('install [name]', 'install one or more packages')
+  .parse(process.argv);
diff --git a/test/fixtures/another-dir/pm b/tests/fixtures/another-dir/pm
similarity index 100%
rename from test/fixtures/another-dir/pm
rename to tests/fixtures/another-dir/pm
diff --git a/test/fixtures/inspect-sub.js b/tests/fixtures/inspect-sub.js
similarity index 100%
rename from test/fixtures/inspect-sub.js
rename to tests/fixtures/inspect-sub.js
diff --git a/test/fixtures/inspect.js b/tests/fixtures/inspect.js
similarity index 100%
rename from test/fixtures/inspect.js
rename to tests/fixtures/inspect.js
diff --git a/test/fixtures/other-dir/pm b/tests/fixtures/other-dir/pm
similarity index 100%
rename from test/fixtures/other-dir/pm
rename to tests/fixtures/other-dir/pm
diff --git a/test/fixtures/pm b/tests/fixtures/pm
similarity index 83%
rename from test/fixtures/pm
rename to tests/fixtures/pm
index e080a33d7..41ca23bd1 100755
--- a/test/fixtures/pm
+++ b/tests/fixtures/pm
@@ -7,10 +7,12 @@ program
   .command('install [name]', 'install one or more packages').alias('i')
   .command('search [query]', 'search with optional query').alias('s')
   .command('cache', 'actions dealing with the cache').alias('c')
-  .command('list', 'list packages installed')
+  .command('echo', 'echo arguments')
+  .command('list', 'list packages installed').alias('lst')
   .command('listen', 'listen for supported signal events').alias('l')
   .command('publish', 'publish or update package').alias('p')
   .command('default', 'default command', { noHelp: true, isDefault: true })
   .command('specifyInstall', 'specify install subcommand', { executableFile: 'pm-install' })
   .command('specifyPublish', 'specify publish subcommand', { executableFile: 'pm-publish' })
+  .command('silent', 'silently succeed')
   .parse(process.argv);
diff --git a/tests/fixtures/pm-cache-clear.js b/tests/fixtures/pm-cache-clear.js
new file mode 100644
index 000000000..f7fea0845
--- /dev/null
+++ b/tests/fixtures/pm-cache-clear.js
@@ -0,0 +1 @@
+console.log('cache-clear');
diff --git a/tests/fixtures/pm-cache-validate.js b/tests/fixtures/pm-cache-validate.js
new file mode 100644
index 000000000..64ffbd5da
--- /dev/null
+++ b/tests/fixtures/pm-cache-validate.js
@@ -0,0 +1 @@
+console.log('cache-validate');
diff --git a/test/fixtures/pm-cache.js b/tests/fixtures/pm-cache.js
similarity index 100%
rename from test/fixtures/pm-cache.js
rename to tests/fixtures/pm-cache.js
diff --git a/test/fixtures/pm-default b/tests/fixtures/pm-default
similarity index 100%
rename from test/fixtures/pm-default
rename to tests/fixtures/pm-default
diff --git a/tests/fixtures/pm-echo.js b/tests/fixtures/pm-echo.js
new file mode 100644
index 000000000..71ebf9978
--- /dev/null
+++ b/tests/fixtures/pm-echo.js
@@ -0,0 +1 @@
+console.log(process.argv.slice(2));
diff --git a/tests/fixtures/pm-install b/tests/fixtures/pm-install
new file mode 100755
index 000000000..ce5120f7f
--- /dev/null
+++ b/tests/fixtures/pm-install
@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+console.log('install');
diff --git a/tests/fixtures/pm-listen b/tests/fixtures/pm-listen
new file mode 100755
index 000000000..858d02596
--- /dev/null
+++ b/tests/fixtures/pm-listen
@@ -0,0 +1,29 @@
+#!/usr/bin/env node
+
+process.on('SIGUSR1', function() {
+  process.stdout.write('SIGUSR1');
+  process.exit();
+});
+
+process.on('SIGUSR2', function() {
+  process.stdout.write('SIGUSR2');
+  process.exit();
+});
+
+process.on('SIGTERM', function() {
+  process.stdout.write('SIGTERM');
+  process.exit();
+});
+
+process.on('SIGINT', function() {
+  process.stdout.write('SIGINT');
+  process.exit();
+});
+
+process.on('SIGHUP', function() {
+  process.stdout.write('SIGHUP');
+  process.exit();
+});
+
+process.stdout.write('Listening for signal...');
+setInterval(function() {}, 1000); // Stay running
diff --git a/test/fixtures/pm-publish.js b/tests/fixtures/pm-publish.js
similarity index 96%
rename from test/fixtures/pm-publish.js
rename to tests/fixtures/pm-publish.js
index 1c21a0147..4b91736cf 100644
--- a/test/fixtures/pm-publish.js
+++ b/tests/fixtures/pm-publish.js
@@ -1,2 +1 @@
 console.log('publish');
-
diff --git a/tests/fixtures/pm-search b/tests/fixtures/pm-search
new file mode 100644
index 000000000..5284a6390
--- /dev/null
+++ b/tests/fixtures/pm-search
@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+console.log('search');
diff --git a/tests/fixtures/pm-silent b/tests/fixtures/pm-silent
new file mode 100755
index 000000000..018dc1d57
--- /dev/null
+++ b/tests/fixtures/pm-silent
@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+
+// This is a subcommand which succeeds and does not write any output, for using from unit test
diff --git a/test/fixtures/pmlink b/tests/fixtures/pmlink
similarity index 100%
rename from test/fixtures/pmlink
rename to tests/fixtures/pmlink
diff --git a/tests/fixtures/pmlink-install b/tests/fixtures/pmlink-install
new file mode 100755
index 000000000..ce5120f7f
--- /dev/null
+++ b/tests/fixtures/pmlink-install
@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+console.log('install');
diff --git a/tests/openIssues.test.js.skip b/tests/openIssues.test.js.skip
new file mode 100644
index 000000000..957ae142f
--- /dev/null
+++ b/tests/openIssues.test.js.skip
@@ -0,0 +1,69 @@
+const commander = require('../');
+const childProcess = require('child_process');
+const path = require('path');
+
+describe('open issues', () => {
+  // https://github.com/tj/commander.js/issues/1039
+  test('#1039: when unknown option then unknown option detected', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride();
+    expect(() => {
+      program.parse(['node', 'text', '--bug']);
+    }).toThrow();
+  });
+
+  test('#1039: when unknown option and multiple arguments then unknown option detected', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride();
+    expect(() => {
+      program.parse(['node', 'text', '--bug', '0', '1', '2', '3']);
+    }).toThrow();
+  });
+
+  // https://github.com/tj/commander.js/issues/1032
+  function createProgram1032() {
+    const program = new commander.Command();
+    program
+      .command('doit [id]')
+      .option('--better', 'do it better')
+      .action((id, cmd) => {
+      });
+    return program;
+  };
+
+  test('#1032: when specify subcommand then args not empty', () => {
+    const program = createProgram1032();
+    program.parse(['node', 'test.js', 'doit', 'myid']);
+    expect(program.args.length).toBeGreaterThan(0);
+  });
+
+  test('#1032: when specify subcommand and option then args not empty', () => {
+    const program = createProgram1032();
+    program.parse(['node', 'test.js', 'doit', '--better', 'myid']);
+    expect(program.args.length).toBeGreaterThan(0);
+  });
+
+  // https://github.com/tj/commander.js/issues/561
+  test('#561: when specify argument and unknown option then error', () => {
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .option('-x, --x-flag', 'A flag')
+      .arguments('<file>');
+
+    expect(() => {
+      program.parse(['node', 'test', '--NONSENSE', '1', '2', '3']);
+    }).toThrow();
+  });
+
+  // https://github.com/tj/commander.js/issues/508
+  test('#508: when arguments to executable include option flags then argument order preserved', (done) => {
+    const pm = path.join(__dirname, 'fixtures/pm');
+    childProcess.execFile('node', [pm, 'echo', '1', '2', '--dry-run', '3', '4', '5', '6'], function(_error, stdout, stderr) {
+      expect(stdout).toBe("[ '1', '2', '--dry-run', '3', '4', '5', '6' ]\n");
+      done();
+    });
+  });
+});
diff --git a/tests/options.bool.combo.test.js b/tests/options.bool.combo.test.js
new file mode 100644
index 000000000..0843cd5b7
--- /dev/null
+++ b/tests/options.bool.combo.test.js
@@ -0,0 +1,124 @@
+const commander = require('../');
+
+// Test combination of flag and --no-flag
+// (single flags tested in options.bool.test.js)
+
+// boolean option combo with no default
+describe('boolean option combo with no default', () => {
+  function createPepperProgram() {
+    const program = new commander.Command();
+    program
+      .option('-p, --pepper', 'add pepper')
+      .option('-P, --no-pepper', 'remove pepper');
+    return program;
+  }
+
+  test('when boolean combo not specified then value is undefined', () => {
+    const program = createPepperProgram();
+    program.parse(['node', 'test']);
+    expect(program.pepper).toBeUndefined();
+  });
+
+  test('when boolean combo positive then value is true', () => {
+    const program = createPepperProgram();
+    program.parse(['node', 'test', '--pepper']);
+    expect(program.pepper).toBe(true);
+  });
+
+  test('when boolean combo negative then value is false', () => {
+    const program = createPepperProgram();
+    program.parse(['node', 'test', '--no-pepper']);
+    expect(program.pepper).toBe(false);
+  });
+
+  test('when boolean combo last is positive then value is true', () => {
+    const program = createPepperProgram();
+    program.parse(['node', 'test', '--no-pepper', '--pepper']);
+    expect(program.pepper).toBe(true);
+  });
+
+  test('when boolean combo last is negative then value is false', () => {
+    const program = createPepperProgram();
+    program.parse(['node', 'test', '--pepper', '--no-pepper']);
+    expect(program.pepper).toBe(false);
+  });
+});
+
+// Flag with default, say from an environment variable.
+
+function createPepperProgramWithDefault(defaultValue) {
+  const program = new commander.Command();
+  program
+    .option('-p, --pepper', 'add pepper', defaultValue)
+    .option('-P, --no-pepper', 'remove pepper');
+  return program;
+}
+
+// boolean option combo, default true, long flags
+describe('boolean option combo, default true, long flags', () => {
+  test('when boolean combo not specified then value is true', () => {
+    const program = createPepperProgramWithDefault(true);
+    program.parse(['node', 'test']);
+    expect(program.pepper).toBe(true);
+  });
+
+  test('when boolean combo positive then value is true', () => {
+    const program = createPepperProgramWithDefault(true);
+    program.parse(['node', 'test', '--pepper']);
+    expect(program.pepper).toBe(true);
+  });
+
+  test('when boolean combo negative then value is false', () => {
+    const program = createPepperProgramWithDefault(true);
+    program.parse(['node', 'test', '--no-pepper']);
+    expect(program.pepper).toBe(false);
+  });
+});
+
+// boolean option combo, default false, short flags
+describe('boolean option combo, default false, short flags', () => {
+  test('when boolean combo not specified then value is false', () => {
+    const program = createPepperProgramWithDefault(false);
+    program.parse(['node', 'test']);
+    expect(program.pepper).toBe(false);
+  });
+
+  test('when boolean combo positive then value is true', () => {
+    const program = createPepperProgramWithDefault(false);
+    program.parse(['node', 'test', '-p']);
+    expect(program.pepper).toBe(true);
+  });
+
+  test('when boolean combo negative then value is false', () => {
+    const program = createPepperProgramWithDefault(false);
+    program.parse(['node', 'test', '-P']);
+    expect(program.pepper).toBe(false);
+  });
+});
+
+// This is a somewhat undocumented special behaviour which appears in some examples.
+// When a flag has a non-boolean default, it is used as the value (only) when the flag is specified.
+//
+// boolean option combo with non-boolean default
+describe('boolean option combo with non-boolean default', () => {
+  test('when boolean combo not specified then value is undefined', () => {
+    const flagValue = 'red';
+    const program = createPepperProgramWithDefault(flagValue);
+    program.parse(['node', 'test']);
+    expect(program.pepper).toBeUndefined();
+  });
+
+  test('when boolean combo positive then value is "default" value', () => {
+    const flagValue = 'red';
+    const program = createPepperProgramWithDefault(flagValue);
+    program.parse(['node', 'test', '--pepper']);
+    expect(program.pepper).toBe(flagValue);
+  });
+
+  test('when boolean combo negative then value is false', () => {
+    const flagValue = 'red';
+    const program = createPepperProgramWithDefault(flagValue);
+    program.parse(['node', 'test', '--no-pepper']);
+    expect(program.pepper).toBe(false);
+  });
+});
diff --git a/tests/options.bool.small.combined.test.js b/tests/options.bool.small.combined.test.js
new file mode 100644
index 000000000..7b5ef1974
--- /dev/null
+++ b/tests/options.bool.small.combined.test.js
@@ -0,0 +1,13 @@
+const commander = require('../');
+
+test('when when multiple short flags specified then all values are true', () => {
+  const program = new commander.Command();
+  program
+    .option('-p, --pepper', 'add pepper')
+    .option('-c, --cheese', 'add cheese');
+
+  program.parse(['node', 'test', '-pc']);
+
+  expect(program.pepper).toBe(true);
+  expect(program.cheese).toBe(true);
+});
diff --git a/tests/options.bool.test.js b/tests/options.bool.test.js
new file mode 100644
index 000000000..6d860ef41
--- /dev/null
+++ b/tests/options.bool.test.js
@@ -0,0 +1,109 @@
+const commander = require('../');
+
+// Test simple flag and negatable flag
+
+// boolean flag on program
+describe('boolean flag on program', () => {
+  test('when boolean flag not specified then value is undefined', () => {
+    const program = new commander.Command();
+    program
+      .option('--pepper', 'add pepper');
+    program.parse(['node', 'test']);
+    expect(program.pepper).toBeUndefined();
+  });
+
+  test('when boolean flag specified then value is true', () => {
+    const program = new commander.Command();
+    program
+      .option('--pepper', 'add pepper');
+    program.parse(['node', 'test', '--pepper']);
+    expect(program.pepper).toBe(true);
+  });
+
+  test('when negatable boolean flag not specified then value is true', () => {
+    const program = new commander.Command();
+    program
+      .option('--no-cheese', 'remove cheese');
+    program.parse(['node', 'test']);
+    expect(program.cheese).toBe(true);
+  });
+
+  test('when negatable boolean flag specified then value is false', () => {
+    const program = new commander.Command();
+    program
+      .option('--no-cheese', 'remove cheese');
+    program.parse(['node', 'test', '--no-cheese']);
+    expect(program.cheese).toBe(false);
+  });
+});
+
+// boolean flag on command
+describe('boolean flag on command', () => {
+  test('when boolean flag not specified then value is undefined', () => {
+    let subCommand;
+    const program = new commander.Command();
+    program
+      .command('sub')
+      .option('--pepper', 'add pepper')
+      .action((cmd) => { subCommand = cmd; });
+    program.parse(['node', 'test', 'sub']);
+    expect(subCommand.pepper).toBeUndefined();
+  });
+
+  test('when boolean flag specified then value is true', () => {
+    let subCommand;
+    const program = new commander.Command();
+    program
+      .command('sub')
+      .option('--pepper', 'add pepper')
+      .action((cmd) => { subCommand = cmd; });
+    program.parse(['node', 'test', 'sub', '--pepper']);
+    expect(subCommand.pepper).toBe(true);
+  });
+
+  test('when negatable boolean flag not specified then value is true', () => {
+    let subCommand;
+    const program = new commander.Command();
+    program
+      .command('sub')
+      .option('--no-cheese', 'remove cheese')
+      .action((cmd) => { subCommand = cmd; });
+    program.parse(['node', 'test', 'sub']);
+    expect(subCommand.cheese).toBe(true);
+  });
+
+  test('when negatable boolean flag specified then value is false', () => {
+    let subCommand;
+    const program = new commander.Command();
+    program
+      .command('sub')
+      .option('--no-cheese', 'remove cheese')
+      .action((cmd) => { subCommand = cmd; });
+    program.parse(['node', 'test', 'sub', '--no-cheese']);
+    expect(subCommand.cheese).toBe(false);
+  });
+});
+
+// This is a somewhat undocumented special behaviour which appears in some examples.
+// When a flag has a non-boolean default, it is used as the value (only) when the flag is specified.
+//
+// boolean flag with non-boolean default
+describe('boolean flag with non-boolean default', () => {
+  test('when flag not specified then value is undefined', () => {
+    const flagValue = 'black';
+    const program = new commander.Command();
+    program
+      .option('--olives', 'Add olives? Sorry we only have black.', flagValue);
+    program.parse(['node', 'test']);
+    expect(program.olives).toBeUndefined();
+  });
+
+  test('when flag specified then value is "default" value', () => {
+    const flagValue = 'black';
+    const program = new commander.Command();
+    program
+      .option('-v, --olives', 'Add olives? Sorry we only have black.', flagValue);
+    program.parse(['node', 'test', '--olives']);
+    expect(program.olives).toBe(flagValue);
+  });
+});
diff --git a/tests/options.camelcase.test.js b/tests/options.camelcase.test.js
new file mode 100644
index 000000000..9de695cc7
--- /dev/null
+++ b/tests/options.camelcase.test.js
@@ -0,0 +1,51 @@
+const commander = require('../');
+
+// Capitalise the letters of words after dashes, but otherwise preserve case
+
+test('when option defined with --word-word then option property is wordWord', () => {
+  const program = new commander.Command();
+  program
+    .option('--my-option', 'description');
+  program.parse(['node', 'test', '--my-option']);
+  expect(program.myOption).toBe(true);
+});
+
+test('when option defined with --word-wORD then option property is wordWORD', () => {
+  const program = new commander.Command();
+  program
+    .option('--my-oPTION', 'description');
+  program.parse(['node', 'test', '--my-oPTION']);
+  expect(program.myOPTION).toBe(true);
+});
+
+test('when option defined with --word-WORD then option property is wordWORD', () => {
+  const program = new commander.Command();
+  program
+    .option('--my-OPTION', 'description');
+  program.parse(['node', 'test', '--my-OPTION']);
+  expect(program.myOPTION).toBe(true);
+});
+
+test('when option defined with --word-word-word then option property is wordWordWord', () => {
+  const program = new commander.Command();
+  program
+    .option('--my-special-option', 'description');
+  program.parse(['node', 'test', '--my-special-option']);
+  expect(program.mySpecialOption).toBe(true);
+});
+
+test('when option defined with --word-WORD-word then option property is wordWORDWord', () => {
+  const program = new commander.Command();
+  program
+    .option('--my-SPECIAL-option', 'description');
+  program.parse(['node', 'test', '--my-SPECIAL-option']);
+  expect(program.mySPECIALOption).toBe(true);
+});
+
+test('when option defined with --Word then option property is Word', () => {
+  const program = new commander.Command();
+  program
+    .option('--Myoption', 'description');
+  program.parse(['node', 'test', '--Myoption']);
+  expect(program.Myoption).toBe(true);
+});
diff --git a/tests/options.custom-processing.test.js b/tests/options.custom-processing.test.js
new file mode 100644
index 000000000..d5a9b98b8
--- /dev/null
+++ b/tests/options.custom-processing.test.js
@@ -0,0 +1,141 @@
+const commander = require('../');
+
+function myParseInt(value, dummyPrevious) {
+  // parseInt takes a string and a radix
+  return parseInt(value, 10);
+}
+
+function increaseVerbosity(dummyValue, previous) {
+  return previous + 1;
+}
+
+function collect(value, previous) {
+  return previous.concat([value]);
+}
+
+function commaSeparatedList(value, dummyPrevious) {
+  return value.split(',');
+}
+
+test('when option not specified then callback not called', () => {
+  const mockCoercion = jest.fn();
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <n>', 'number', mockCoercion);
+  program.parse(['node', 'test']);
+  expect(mockCoercion).not.toHaveBeenCalled();
+});
+
+test('when option not specified then value is undefined', () => {
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <n>', 'number', myParseInt);
+  program.parse(['node', 'test']);
+  expect(program.integer).toBeUndefined();
+});
+
+test('when starting value is defined and option not specified then callback not called', () => {
+  const mockCoercion = jest.fn();
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <n>', 'number', mockCoercion, 1);
+  program.parse(['node', 'test']);
+  expect(mockCoercion).not.toHaveBeenCalled();
+});
+
+test('when starting value is defined and option not specified then value is starting value', () => {
+  // NB: Can not specify a starting value for a boolean flag! Discovered when writing this test...
+  const startingValue = 1;
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <n>', 'number', myParseInt, startingValue);
+  program.parse(['node', 'test']);
+  expect(program.integer).toBe(startingValue);
+});
+
+test('when option specified then callback called with value', () => {
+  const mockCoercion = jest.fn();
+  const value = '1';
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <n>', 'number', mockCoercion);
+  program.parse(['node', 'test', '-i', value]);
+  expect(mockCoercion).toHaveBeenCalledWith(value, undefined);
+});
+
+test('when option specified then value is as returned from callback ', () => {
+  const callbackResult = 2;
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <n>', 'number', () => {
+      return callbackResult;
+    });
+  program.parse(['node', 'test', '-i', '0']);
+  expect(program.integer).toBe(callbackResult);
+});
+
+test('when starting value is defined and option specified then callback called with value and starting value', () => {
+  const mockCoercion = jest.fn();
+  const startingValue = 1;
+  const value = '2';
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <n>', 'number', mockCoercion, startingValue);
+  program.parse(['node', 'test', '-i', value]);
+  expect(mockCoercion).toHaveBeenCalledWith(value, startingValue);
+});
+
+test('when option specified multiple times then callback called with value and previousValue', () => {
+  const mockCoercion = jest.fn().mockImplementation(() => {
+    return 'callback';
+  });
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <n>', 'number', mockCoercion);
+  program.parse(['node', 'test', '-i', '1', '-i', '2']);
+  expect(mockCoercion).toHaveBeenCalledTimes(2);
+  expect(mockCoercion).toHaveBeenNthCalledWith(1, '1', undefined);
+  expect(mockCoercion).toHaveBeenNthCalledWith(2, '2', 'callback');
+});
+
+// Now some functional tests like the examples in the README!
+
+test('when parseFloat "1e2" then value is 100', () => {
+  const program = new commander.Command();
+  program
+    .option('-f, --float <number>', 'float argument', parseFloat);
+  program.parse(['node', 'test', '-f', '1e2']);
+  expect(program.float).toBe(100);
+});
+
+test('when myParseInt "1" then value is 1', () => {
+  const program = new commander.Command();
+  program
+    .option('-i, --integer <number>', 'integer argument', myParseInt);
+  program.parse(['node', 'test', '-i', '1']);
+  expect(program.integer).toBe(1);
+});
+
+test('when increaseVerbosity -v -v -v then value is 3', () => {
+  const program = new commander.Command();
+  program
+    .option('-v, --verbose', 'verbosity that can be increased', increaseVerbosity, 0);
+  program.parse(['node', 'test', '-v', '-v', '-v']);
+  expect(program.verbose).toBe(3);
+});
+
+test('when collect -c a -c b -c c then value is [a, b, c]', () => {
+  const program = new commander.Command();
+  program
+    .option('-c, --collect <value>', 'repeatable value', collect, []);
+  program.parse(['node', 'test', '-c', 'a', '-c', 'b', '-c', 'c']);
+  expect(program.collect).toEqual(['a', 'b', 'c']);
+});
+
+test('when commaSeparatedList x,y,z then value is [x, y, z]', () => {
+  const program = new commander.Command();
+  program
+    .option('-l, --list <items>', 'comma separated list', commaSeparatedList);
+  program.parse(['node', 'test', '--list', 'x,y,z']);
+  expect(program.list).toEqual(['x', 'y', 'z']);
+});
diff --git a/tests/options.flags.test.js b/tests/options.flags.test.js
new file mode 100644
index 000000000..9c692461b
--- /dev/null
+++ b/tests/options.flags.test.js
@@ -0,0 +1,76 @@
+const commander = require('../');
+
+// Test the various ways flags can be specified in the first parameter to `.option`
+
+test('when only short flag defined and specified then value is true', () => {
+  const program = new commander.Command();
+  program
+    .option('-p', 'add pepper');
+  program.parse(['node', 'test', '-p']);
+  expect(program.P).toBe(true);
+});
+
+// Sanity check that pepper is not true normally, as otherwise all the following tests would pass for thr wrong reasons!
+test('when only long flag defined and not specified then value is undefined', () => {
+  const program = new commander.Command();
+  program
+    .option('--pepper', 'add pepper');
+  program.parse(['node', 'test']);
+  expect(program.pepper).toBeUndefined();
+});
+
+test('when only long flag defined and specified then value is true', () => {
+  const program = new commander.Command();
+  program
+    .option('--pepper', 'add pepper');
+  program.parse(['node', 'test', '--pepper']);
+  expect(program.pepper).toBe(true);
+});
+
+test('when "short,long" flags defined and short specified then value is true', () => {
+  const program = new commander.Command();
+  program
+    .option('-p,--pepper', 'add pepper');
+  program.parse(['node', 'test', '-p']);
+  expect(program.pepper).toBe(true);
+});
+
+test('when "short,long" flags defined and long specified then value is true', () => {
+  const program = new commander.Command();
+  program
+    .option('-p,--pepper', 'add pepper');
+  program.parse(['node', 'test', '--pepper']);
+  expect(program.pepper).toBe(true);
+});
+
+test('when "short|long" flags defined and short specified then value is true', () => {
+  const program = new commander.Command();
+  program
+    .option('-p|--pepper', 'add pepper');
+  program.parse(['node', 'test', '-p']);
+  expect(program.pepper).toBe(true);
+});
+
+test('when "short|long" flags defined and long specified then value is true', () => {
+  const program = new commander.Command();
+  program
+    .option('-p|--pepper', 'add pepper');
+  program.parse(['node', 'test', '--pepper']);
+  expect(program.pepper).toBe(true);
+});
+
+test('when "short long" flags defined and short specified then value is true', () => {
+  const program = new commander.Command();
+  program
+    .option('-p --pepper', 'add pepper');
+  program.parse(['node', 'test', '-p']);
+  expect(program.pepper).toBe(true);
+});
+
+test('when "short long" flags defined and long specified then value is true', () => {
+  const program = new commander.Command();
+  program
+    .option('-p --pepper', 'add pepper');
+  program.parse(['node', 'test', '--pepper']);
+  expect(program.pepper).toBe(true);
+});
diff --git a/tests/options.optional.test.js b/tests/options.optional.test.js
new file mode 100644
index 000000000..52b766508
--- /dev/null
+++ b/tests/options.optional.test.js
@@ -0,0 +1,70 @@
+const commander = require('../');
+
+// option with optional value, no default
+describe('option with optional value, no default', () => {
+  test('when option not specified then value is undefined', () => {
+    const program = new commander.Command();
+    program
+      .option('--cheese [type]', 'cheese type');
+    program.parse(['node', 'test']);
+    expect(program.cheese).toBeUndefined();
+  });
+
+  test('when option specified then value is as specified', () => {
+    const program = new commander.Command();
+    program
+      .option('--cheese [type]', 'cheese type');
+    const cheeseType = 'blue';
+    program.parse(['node', 'test', '--cheese', cheeseType]);
+    expect(program.cheese).toBe(cheeseType);
+  });
+
+  test('when option specified without value then value is true', () => {
+    const program = new commander.Command();
+    program
+      .option('--cheese [type]', 'cheese type');
+    program.parse(['node', 'test', '--cheese']);
+    expect(program.cheese).toBe(true);
+  });
+
+  test('when option specified without value and following option then value is true', () => {
+    // optional options do not eat values with dashes
+    const program = new commander.Command();
+    program
+      .option('--cheese [type]', 'cheese type')
+      .option('--some-option');
+    program.parse(['node', 'test', '--cheese', '--some-option']);
+    expect(program.cheese).toBe(true);
+  });
+});
+
+// option with optional value, with default
+describe('option with optional value, with default', () => {
+  test('when option not specified then value is default', () => {
+    const defaultValue = 'default';
+    const program = new commander.Command();
+    program
+      .option('--cheese [type]', 'cheese type', defaultValue);
+    program.parse(['node', 'test']);
+    expect(program.cheese).toBe(defaultValue);
+  });
+
+  test('when option specified then value is as specified', () => {
+    const defaultValue = 'default';
+    const program = new commander.Command();
+    program
+      .option('--cheese [type]', 'cheese type', defaultValue);
+    const cheeseType = 'blue';
+    program.parse(['node', 'test', '--cheese', cheeseType]);
+    expect(program.cheese).toBe(cheeseType);
+  });
+
+  test('when option specified without value then value is default', () => {
+    const defaultValue = 'default';
+    const program = new commander.Command();
+    program
+      .option('--cheese [type]', 'cheese type', defaultValue);
+    program.parse(['node', 'test', '--cheese']);
+    expect(program.cheese).toBe(defaultValue);
+  });
+});
diff --git a/tests/options.opts.test.js b/tests/options.opts.test.js
new file mode 100644
index 000000000..83476d9d9
--- /dev/null
+++ b/tests/options.opts.test.js
@@ -0,0 +1,55 @@
+const commander = require('../');
+
+// Test the `.opts()` way of accesing option values.
+// Basic coverage of the main option types (leaving out negatable flags and options with optional values).
+
+test('when .version used then version in opts', () => {
+  const program = new commander.Command();
+  const version = '0.0.1';
+  program
+    .version(version);
+  program.parse(['node', 'test']);
+  expect(program.opts()).toEqual({ version });
+});
+
+test('when boolean flag not specified then not in opts', () => {
+  const program = new commander.Command();
+  program
+    .option('--pepper', 'add pepper');
+  program.parse(['node', 'test']);
+  expect(program.opts()).toEqual({ });
+});
+
+test('when boolean flag specified then value true', () => {
+  const program = new commander.Command();
+  program
+    .option('--pepper', 'add pepper');
+  program.parse(['node', 'test', '--pepper']);
+  expect(program.opts()).toEqual({ pepper: true });
+});
+
+test('when option with required value not specified then not in opts', () => {
+  const program = new commander.Command();
+  program
+    .option('--pepper <flavour>', 'add pepper');
+  program.parse(['node', 'test']);
+  expect(program.opts()).toEqual({ });
+});
+
+test('when option with required value specified then value as specified', () => {
+  const pepperValue = 'red';
+  const program = new commander.Command();
+  program
+    .option('--pepper <flavour>', 'add pepper');
+  program.parse(['node', 'test', '--pepper', pepperValue]);
+  expect(program.opts()).toEqual({ pepper: pepperValue });
+});
+
+test('when option with default value not specified then default value in opts', () => {
+  const pepperDefault = 'red';
+  const program = new commander.Command();
+  program
+    .option('--pepper <flavour>', 'add pepper', pepperDefault);
+  program.parse(['node', 'test']);
+  expect(program.opts()).toEqual({ pepper: pepperDefault });
+});
diff --git a/tests/options.regex.test.js b/tests/options.regex.test.js
new file mode 100644
index 000000000..566f72c49
--- /dev/null
+++ b/tests/options.regex.test.js
@@ -0,0 +1,41 @@
+const commander = require('../');
+
+// NB: regex support is deprecated, and deliberately not documented in README.
+
+describe('option with optional value and regex', () => {
+  test('when option regex fails then value is true [sic]', () => {
+    const program = new commander.Command();
+    program
+      .option('-d, --drink [drink]', 'Drink', /^(Water|Wine)$/i);
+    program.parse(['node', 'test', '--drink', 'does-not-match']);
+    expect(program.drink).toBe(true);
+  });
+
+  test('when option regex matches then value is as specified', () => {
+    const drinkValue = 'water';
+    const program = new commander.Command();
+    program
+      .option('-d, --drink [drink]', 'Drink', /^(Water|Wine)$/i);
+    program.parse(['node', 'test', '--drink', drinkValue]);
+    expect(program.drink).toBe(drinkValue);
+  });
+});
+
+describe('option with required value and regex', () => {
+  test('when option regex fails then value is true [sic]', () => {
+    const program = new commander.Command();
+    program
+      .option('-d, --drink <drink>', 'Drink', /^(Water|Wine)$/i);
+    program.parse(['node', 'test', '--drink', 'does-not-match']);
+    expect(program.drink).toBe(true);
+  });
+
+  test('when option regex matches then value is as specified', () => {
+    const drinkValue = 'water';
+    const program = new commander.Command();
+    program
+      .option('-d, --drink [drink]', 'Drink', /^(Water|Wine)$/i);
+    program.parse(['node', 'test', '--drink', drinkValue]);
+    expect(program.drink).toBe(drinkValue);
+  });
+});
diff --git a/tests/options.required.test.js b/tests/options.required.test.js
new file mode 100644
index 000000000..3e0a72225
--- /dev/null
+++ b/tests/options.required.test.js
@@ -0,0 +1,82 @@
+const commander = require('../');
+
+// option with required value, no default
+describe('option with required value, no default', () => {
+  test('when option not specified then value is undefined', () => {
+    const program = new commander.Command();
+    program
+      .option('--cheese <type>', 'cheese type');
+    program.parse(['node', 'test']);
+    expect(program.cheese).toBeUndefined();
+  });
+
+  test('when option specified then value is as specified', () => {
+    const program = new commander.Command();
+    program
+      .option('--cheese <type>', 'cheese type');
+    const cheeseType = 'blue';
+    program.parse(['node', 'test', '--cheese', cheeseType]);
+    expect(program.cheese).toBe(cheeseType);
+  });
+
+  test('when option value not specified then error', () => {
+    // Arrange. Mock error routine to allow interception.
+    const mockOptionMissingArgument = jest.fn(() => {
+      throw new Error('optionMissingArgument');
+    });
+    const program = new commander.Command();
+    program.optionMissingArgument = mockOptionMissingArgument;
+    program
+      .option('--cheese <type>', 'cheese type');
+
+    // Act. The throw is due to the above mock, and not default behaviour.
+    expect(() => {
+      program.parse(['node', 'test', '--cheese']);
+    }).toThrow();
+
+    // Assert
+    expect(mockOptionMissingArgument).toHaveBeenCalled();
+  });
+});
+
+// option with required value, with default
+describe('option with required value, with default', () => {
+  test('when option not specified then value is default', () => {
+    const defaultValue = 'default';
+    const program = new commander.Command();
+    program
+      .option('--cheese <type>', 'cheese type', defaultValue);
+    program.parse(['node', 'test']);
+    expect(program.cheese).toBe(defaultValue);
+  });
+
+  test('when option specified then value is as specified', () => {
+    const defaultValue = 'default';
+    const program = new commander.Command();
+    program
+      .option('--cheese <type>', 'cheese type', defaultValue);
+    const cheeseType = 'blue';
+    program.parse(['node', 'test', '--cheese', cheeseType]);
+    expect(program.cheese).toBe(cheeseType);
+  });
+
+  test('when option value not specified then error', () => {
+    // Arrange. Mock error routine to allow interception.
+    const mockOptionMissingArgument = jest.fn(() => {
+      throw new Error('optionMissingArgument');
+    });
+    const defaultValue = 'default';
+    const program = new commander.Command();
+    program.optionMissingArgument = mockOptionMissingArgument;
+    program
+      .option('--cheese <type>', 'cheese type', defaultValue);
+
+    // Act. The throw is due to the above mock, and not default behaviour.
+    expect(() => {
+      program.parse(['node', 'test', '--cheese']);
+    }).toThrow();
+
+    // Assert
+    expect(mockOptionMissingArgument).toHaveBeenCalled();
+  });
+});
diff --git a/tests/options.values.test.js b/tests/options.values.test.js
new file mode 100644
index 000000000..0c11b439b
--- /dev/null
+++ b/tests/options.values.test.js
@@ -0,0 +1,82 @@
+const commander = require('../');
+
+// Test the ways values can be specified for options.
+
+// options with required values can eat values starting with a dash, including just dash sometimes used as alias for stdin
+//
+// option with required value, using describe.each to test all matrix of values and tests
+describe.each([['str'], ['80'], ['-'], ['-5'], ['--flag']])(
+  'option with required value specified as %s', (value) => {
+    function createPortProgram() {
+      const program = new commander.Command();
+      program
+        .option('-p,--port <number>', 'specify port');
+      return program;
+    }
+
+    test('when short flag followed by value then value is as specified', () => {
+      const program = createPortProgram();
+      program.parse(['node', 'test', '-p', value]);
+      expect(program.port).toBe(value);
+    });
+
+    test('when short flag concatenated with value then value is as specified', () => {
+      const program = createPortProgram();
+      program.parse(['node', 'test', `-p${value}`]);
+      expect(program.port).toBe(value);
+    });
+
+    test('when long flag followed by value then value is as specified', () => {
+      const program = createPortProgram();
+      program.parse(['node', 'test', '--port', value]);
+      expect(program.port).toBe(value);
+    });
+
+    test('when long flag = value then value is as specified', () => {
+      const program = createPortProgram();
+      program.parse(['node', 'test', `--port=${value}`]);
+      expect(program.port).toBe(value);
+    });
+  });
+
+// option with optional value
+describe('option with optional value', () => {
+  function createPortProgram() {
+    const program = new commander.Command();
+    program
+      .option('-p,--port [number]', 'specify port');
+    return program;
+  }
+
+  test('when short flag followed by value then value is as specified', () => {
+    const program = createPortProgram();
+    program.parse('node test -p 80'.split(' '));
+    expect(program.port).toBe('80');
+  });
+
+  test('when short flag concatenated with value then value is as specified', () => {
+    const program = createPortProgram();
+    program.parse('node test -p80'.split(' '));
+    expect(program.port).toBe('80');
+  });
+
+  test('when long flag followed by value then value is as specified', () => {
+    const program = createPortProgram();
+    program.parse('node test --port 80'.split(' '));
+    expect(program.port).toBe('80');
+  });
+
+  test('when long flag = value then value is as specified', () => {
+    const program = createPortProgram();
+    program.parse('node test --port=80'.split(' '));
+    expect(program.port).toBe('80');
+  });
+
+  test('when long flag followed empty string then value is empty string', () => {
+    const program = createPortProgram();
+    program
+      .option('-c, --cheese [type]', 'optionally specify the type of cheese');
+    program.parse(['node', 'test', '--cheese', '']);
+    expect(program.cheese).toBe('');
+  });
+});
diff --git a/tests/options.version.test.js b/tests/options.version.test.js
new file mode 100644
index 000000000..f0f92bdf2
--- /dev/null
+++ b/tests/options.version.test.js
@@ -0,0 +1,144 @@
+const commander = require('../');
+
+// Test .version. Using _exitOverride to check behaviour (instead of mocking process.exit).
+
+describe('.version', () => {
+  // Optional. Suppress normal output to keep test output clean.
+  let writeSpy;
+
+  beforeAll(() => {
+    writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
+  });
+
+  afterEach(() => {
+    writeSpy.mockClear();
+  });
+
+  afterAll(() => {
+    writeSpy.mockRestore();
+  });
+
+  test('when no .version and specify --version then unknown option error', () => {
+    const errorMessage = 'unknownOption';
+    const program = new commander.Command();
+    // Override unknownOption as convenient way to check fails as expected.
+    jest.spyOn(program, 'unknownOption').mockImplementation(() => { throw new Error(errorMessage); });
+
+    expect(() => {
+      program.parse(['node', 'test', '--version']);
+    }).toThrow(errorMessage);
+  });
+
+  test('when no .version then helpInformation does not include version', () => {
+    const program = new commander.Command();
+
+    const helpInformation = program.helpInformation();
+
+    expect(helpInformation.includes('Usage')).toBe(true);
+    expect(helpInformation.includes('version')).toBe(false);
+  });
+
+  test('when specify default short flag then display version', () => {
+    const myVersion = '1.2.3';
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .version(myVersion);
+
+    expect(() => {
+      program.parse(['node', 'test', '-V']);
+    }).toThrow(myVersion);
+
+    // Test output once as well, rest of tests just check the thrown message.
+    expect(writeSpy).toHaveBeenCalledWith(`${myVersion}\n`);
+  });
+
+  test('when specify default long flag then display version', () => {
+    const myVersion = '1.2.3';
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .version(myVersion);
+
+    expect(() => {
+      program.parse(['node', 'test', '--version']);
+    }).toThrow(myVersion);
+  });
+
+  test('when default .version then helpInformation includes default version help', () => {
+    const myVersion = '1.2.3';
+    const program = new commander.Command();
+    program
+      .version(myVersion);
+
+    const helpInformation = program.helpInformation();
+
+    expect(helpInformation.includes('-V, --version')).toBe(true);
+    expect(helpInformation.includes('output the version number')).toBe(true);
+  });
+
+  test('when specify custom short flag then display version', () => {
+    const myVersion = '1.2.3';
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .version(myVersion, '-r, --revision');
+
+    expect(() => {
+      program.parse(['node', 'test', '-r']);
+    }).toThrow(myVersion);
+  });
+
+  test('when specify custom long flag then display version', () => {
+    const myVersion = '1.2.3';
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .version(myVersion, '-r, --revision');
+
+    expect(() => {
+      program.parse(['node', 'test', '--revision']);
+    }).toThrow(myVersion);
+  });
+
+  test('when custom .version then helpInformation includes custom version help', () => {
+    const myVersion = '1.2.3';
+    const myVersionFlags = '-r, --revision';
+    const myVersionDescription = 'custom description';
+    const program = new commander.Command();
+    program
+      .version(myVersion, myVersionFlags, myVersionDescription);
+
+    const helpInformation = program.helpInformation();
+
+    expect(helpInformation.includes(myVersionFlags)).toBe(true);
+    expect(helpInformation.includes(myVersionDescription)).toBe(true);
+  });
+
+  test('when have .version+version and specify version then command called', () => {
+    const actionMock = jest.fn();
+    const program = new commander.Command();
+    program
+      .version('1.2.3')
+      .command('version')
+      .action(actionMock);
+
+    program.parse(['node', 'test', 'version']);
+
+    expect(actionMock).toHaveBeenCalled();
+  });
+
+  test('when have .version+version and specify --version then version displayed', () => {
+    const myVersion = '1.2.3';
+    const program = new commander.Command();
+    program
+      ._exitOverride()
+      .version(myVersion)
+      .command('version')
+      .action(() => {});
+
+    expect(() => {
+      program.parse(['node', 'test', '--version']);
+    }).toThrow(myVersion);
+  });
+});