1 files changed, 69 insertions, 0 deletions
diff --git a/deps/npm/test/tap/install-duplicate-deps-warning.js b/deps/npm/test/tap/install-duplicate-deps-warning.js
new file mode 100644
index 0000000000..9206fe253c
--- /dev/null
+++ b/deps/npm/test/tap/install-duplicate-deps-warning.js
@@ -0,0 +1,69 @@
+var fs = require('graceful-fs')
+var path = require('path')
+
+var mkdirp = require('mkdirp')
+var mr = require('npm-registry-mock')
+var osenv = require('osenv')
+var rimraf = require('rimraf')
+var test = require('tap').test
+
+var common = require('../common-tap.js')
+var npm = npm = require('../../')
+
+var pkg = path.resolve(__dirname, path.basename(__filename, '.js'))
+
+var json = {
+  dependencies: {
+    underscore: '1.5.1'
+  },
+  devDependencies: {
+    underscore: '1.3.1'
+  }
+}
+
+test('setup', function (t) {
+  t.comment('test for https://github.com/npm/npm/issues/6725')
+  cleanup()
+  mkdirp.sync(pkg)
+  fs.writeFileSync(
+    path.join(pkg, 'package.json'),
+    JSON.stringify(json, null, 2)
+  )
+  process.chdir(pkg)
+  console.dir(pkg)
+  t.end()
+})
+
+test('npm install with duplicate dependencies, different versions', function (t) {
+  t.plan(1)
+  mr({ port: common.port }, function (er, s) {
+    var opts = {
+      cache: path.resolve(pkg, 'cache'),
+      registry: common.registry
+    }
+
+    npm.load(opts, function (err) {
+      if (err) return t.fail(err)
+
+      npm.install('.', function (err, additions, result) {
+        if (err) return t.fail(err)
+
+        var invalid = result.warnings.filter(function (warning) { return warning.code === 'EDUPLICATEDEP' })
+        t.is(invalid.length, 1, 'got a warning (EDUPLICATEDEP) for duplicate dev/production dependencies')
+
+        s.close()
+        t.end()
+      })
+    })
+  })
+})
+
+test('cleanup', function (t) {
+  cleanup()
+  t.end()
+})
+
+function cleanup () {
+  process.chdir(osenv.tmpdir())
+  rimraf.sync(pkg)
+}