test cli per exec with tap

Author: mashpie

.gitignore

@@ -1,2 +1,4 @@
 /node_modules
 .DS_Store
+/.nyc_output
+/coverage

Makefile

@@ -0,0 +1,7 @@
+test:
+	yarn test
+
+test.coverage:
+	yarn test:cov
+
+.PHONY: test

package.json

@@ -45,7 +45,10 @@
     "eslint-plugin-standard": "^4.0.1",
     "lint-staged": "^9.4.1",
     "prettier": "^1.18.2",
-    "tap": "^14.6.9",
+    "tap": "^14.10.5",
     "yorkie": "^2.0.0"
+  },
+  "resolutions": {
+    "handlebars": "4.5.0"
   }
 }

test/cli.test.js

@@ -0,0 +1,20 @@
+const tap = require('tap')
+const { cli } = require('./helper')
+
+tap.test('$ cli', async t => {
+  const result = await cli([])
+  t.strictEqual(0, result.code, 'Should succeed')
+  t.strictEqual(
+    true,
+    result.stdout.startsWith('Usage: cli [options] [command]'),
+    'Should print usage information'
+  )
+  t.end()
+})
+
+tap.test('$ cli noop', async t => {
+  const result = await cli(['noop'])
+  t.strictEqual(0, result.code, 'Should succeed')
+  t.strictEqual('', result.stdout, 'Should print empty string')
+  t.end()
+})

test/helper.js

@@ -0,0 +1,21 @@
+'use strict'
+
+const path = require('path')
+const exec = require('child_process').exec
+
+module.exports.cli = (args, cwd) => {
+  return new Promise(resolve => {
+    exec(
+      `node ${path.resolve(__dirname, '../bin/cli.js')} ${args.join(' ')}`,
+      { cwd },
+      (error, stdout, stderr) => {
+        resolve({
+          code: error && error.code ? error.code : 0,
+          error,
+          stdout,
+          stderr
+        })
+      }
+    )
+  })
+}

test/noop.test.js

@@ -0,0 +1,6 @@
+const tap = require('tap')
+
+tap.test('Test Setup', t => {
+  t.strictEqual(true, true, 'Tests and assertions should work')
+  t.end()
+})