install: always save package_lock.json when using --package-lock-only (#146)

PR-URL: #146
Credit: @aeschright
Reviewed-By: @zkat

Author: aeschright

Diff for: lib/install/save.js

@@ -44,7 +44,7 @@ exports.saveShrinkwrap = saveShrinkwrap
 
 function saveShrinkwrap (tree, next) {
   validate('OF', arguments)
-  if (!npm.config.get('shrinkwrap') || !npm.config.get('package-lock')) {
+  if (!npm.config.get('package-lock-only') && (!npm.config.get('shrinkwrap') || !npm.config.get('package-lock'))) {
     return next()
   }
   require('../shrinkwrap.js').createShrinkwrap(tree, {silent: false}, next)

Diff for: test/tap/install-package-lock-only.js

@@ -28,6 +28,18 @@ var conf = {
   })
 }
 
+const confPkgLockFalse = {
+  cwd: testdir,
+  env: Object.assign({}, process.env, {
+    npm_config_cache: cachedir,
+    npm_config_tmp: tmpdir,
+    npm_config_prefix: globaldir,
+    npm_config_registry: common.registry,
+    npm_config_loglevel: 'warn',
+    npm_config_package_lock: false
+  })
+}
+
 var server
 var fixture = new Tacks(Dir({
   cache: Dir(),
@@ -54,7 +66,6 @@ function cleanup () {
 }
 
 test('setup', function (t) {
-  setup()
   mr({port: common.port, throwOnUnmatched: true}, function (err, s) {
     if (err) throw err
     server = s
@@ -63,6 +74,7 @@ test('setup', function (t) {
 })
 
 test('package-lock-only', function (t) {
+  setup()
   return common.npm(['install', '--package-lock-only'], conf).spread((code, stdout, stderr) => {
     t.is(code, 0, 'command ran ok')
     t.comment(stdout.trim())
@@ -78,6 +90,32 @@ test('package-lock-only', function (t) {
   })
 })
 
+test('--package-lock-only with --package-lock negates `package_lock: false`', function (t) {
+  setup()
+  return common.npm(['install', '--package-lock', '--package-lock-only'], confPkgLockFalse).spread((code, stdout, stderr) => {
+    t.is(code, 0, 'ok')
+    t.comment(stdout.trim())
+    t.comment(stderr.trim())
+
+    // Verify that package-lock.json exists.
+    t.ok(fs.existsSync(pkgLockPath), 'ensure that package-lock.json was created')
+    t.end()
+  })
+})
+
+test('package-lock-only creates package_lock.json when config has `package_lock: false`', function (t) {
+  setup()
+  return common.npm(['install', '--package-lock-only'], confPkgLockFalse).spread((code, stdout, stderr) => {
+    t.is(code, 0, 'ok')
+    t.comment(stdout.trim())
+    t.comment(stderr.trim())
+
+    // Verify that package-lock.json exists.
+    t.ok(fs.existsSync(pkgLockPath), 'ensure that package-lock.json was created')
+    t.end()
+  })
+})
+
 test('cleanup', function (t) {
   server.close()
   cleanup()