test: Add test for removing global links

PR-URL: #10270
Fixes: #9980
Credit: @iarna

test/tap/gently-rm-linked-module.js

@@ -0,0 +1,106 @@
+var basename = require('path').basename
+var resolve = require('path').resolve
+var fs = require('graceful-fs')
+var test = require('tap').test
+var mkdirp = require('mkdirp')
+var rimraf = require('rimraf')
+
+var common = require('../common-tap.js')
+
+var base = resolve(__dirname, basename(__filename, '.js'))
+var pkg = resolve(base, 'gently-rm-linked')
+var dep = resolve(base, 'test-linked')
+var glb = resolve(base, 'test-global')
+var lnk = resolve(base, 'test-global-link')
+
+var EXEC_OPTS = { cwd: pkg }
+
+var index = "module.exports = function () { console.log('whoop whoop') }"
+
+var fixture = {
+  name: '@test/linked',
+  version: '1.0.0',
+  bin: {
+    linked: './index.js'
+  }
+}
+
+test('setup', function (t) {
+  cleanup()
+  setup()
+
+  t.end()
+})
+
+test('install and link', function (t) {
+  // link our test module into the global folder
+  common.npm(
+    [
+      '--prefix', lnk,
+      '--loglevel', 'error',
+      'link',
+      dep
+    ],
+    EXEC_OPTS,
+    function (er, code, stdout, stderr) {
+      if (er) throw er
+      t.is(code, 0, 'link succeeded')
+      t.is(stderr, '', 'no log output')
+      t.ok(doesModuleExist(), 'installed ok')
+
+      // and try removing it and make sure that succeeds
+      common.npm(
+        [
+          '--global',
+          '--prefix', lnk,
+          '--loglevel', 'error',
+          'rm', '@test/linked'
+        ],
+        EXEC_OPTS,
+        function (er, code, stdout, stderr) {
+          if (er) throw er
+          t.is(code, 0, 'rm succeeded')
+          t.is(stderr, '', 'no log output')
+          t.notOk(doesModuleExist(), 'removed ok')
+          t.end()
+        }
+      )
+    }
+  )
+})
+
+test('cleanup', function (t) {
+  cleanup()
+
+  t.end()
+})
+
+function doesModuleExist () {
+  var binPath = resolve(lnk, 'bin', 'linked')
+  var pkgPath = resolve(lnk, 'lib', 'node_modules', '@test', 'linked')
+  try {
+    fs.statSync(binPath)
+    fs.statSync(pkgPath)
+    return true
+  } catch (ex) {
+    return false
+  }
+}
+
+function cleanup () {
+  rimraf.sync(pkg)
+  rimraf.sync(dep)
+  rimraf.sync(lnk)
+  rimraf.sync(glb)
+}
+
+function setup () {
+  mkdirp.sync(pkg)
+  mkdirp.sync(glb)
+  fs.symlinkSync(glb, lnk)
+  // so it doesn't try to install into npm's own node_modules
+  mkdirp.sync(resolve(pkg, 'node_modules'))
+  mkdirp.sync(dep)
+  fs.writeFileSync(resolve(dep, 'package.json'), JSON.stringify(fixture))
+  fs.writeFileSync(resolve(dep, 'index.js'), index)
+}