bugfix(generate): removes bad imports when generating a class

Fix #2288
Close #2492

Author: Danny Blue

packages/angular-cli/blueprints/class/files/__path__/__name__.spec.ts

@@ -1,6 +1,3 @@
-/* tslint:disable:no-unused-variable */
-
-import { addProviders, async, inject } from '@angular/core/testing';
 import {<%= classifiedModuleName %>} from './<%= fileName %>';
 
 describe('<%= classifiedModuleName %>', () => {

tests/e2e/tests/generate/class.ts

@@ -0,0 +1,16 @@
+import {join} from 'path';
+import {ng} from '../../utils/process';
+import {expectFileToExist} from '../../utils/fs';
+
+
+export default function() {
+  const classDir = join('src', 'app');
+
+  return ng('generate', 'class', 'test-class', '--spec')
+    .then(() => expectFileToExist(classDir))
+    .then(() => expectFileToExist(join(classDir, 'test-class.ts')))
+    .then(() => expectFileToExist(join(classDir, 'test-class.spec.ts')))
+
+    // Try to run the unit tests.
+    .then(() => ng('test', '--watch=false'));
+}