feat(@angular/cli): add --config-file option to ng test

Closes angular#183

Author: Brocco

packages/@angular/cli/commands/test.ts

@@ -14,6 +14,7 @@ export interface TestOptions {
   build?: boolean;
   sourcemap?: boolean;
   progress?: boolean;
+  configFile?: string;
 }
 
 
@@ -29,7 +30,8 @@ const TestCommand = EmberTestCommand.extend({
     { name: 'port', type: Number },
     { name: 'reporters', type: String },
     { name: 'build', type: Boolean, default: true },
-    { name: 'sourcemap', type: Boolean, default: true, aliases: ['sm'] }
+    { name: 'sourcemap', type: Boolean, default: true, aliases: ['sm'] },
+    { name: 'config-file', type: String }
   ],
 
   run: function(commandOptions: TestOptions) {

packages/@angular/cli/tasks/test.ts

@@ -1,14 +1,17 @@
 const Task = require('../ember-cli/lib/models/task');
 import { TestOptions } from '../commands/test';
 import * as path from 'path';
+import * as fs from 'fs';
 import { requireDependency } from '../utilities/require-project-module';
 
 export default Task.extend({
   run: function (options: TestOptions) {
     const projectRoot = this.project.root;
     return new Promise((resolve) => {
       const karma = requireDependency(projectRoot, 'karma');
-      const karmaConfig = path.join(projectRoot, this.project.ngConfig.config.test.karma.config);
+      const karmaConfig = options.configFile ?
+        path.resolve(projectRoot, options.configFile) :
+        path.join(projectRoot, this.project.ngConfig.config.test.karma.config);
 
       let karmaOptions: any = Object.assign({}, options);
 

tests/e2e/tests/test/test-config-file.ts

@@ -0,0 +1,8 @@
+import { ng } from '../../utils/process';
+import { copyFile } from '../../utils/fs';
+
+export default function () {
+  // make sure both --watch=false and --single-run work
+  return Promise.resolve(copyFile('karma.conf.js', 'kc.js'))
+    .then(() => ng('test', '--single-run', '--config-file', 'kc.js'));
+}