title: Angular (4.0.0-beta.8) testing component fixture undefined after test execution with subcomponents
body: <p>I really don't know what is happening, but I have a really strange behaviour when testing my Angular code. I am just setting things up and most things work, but not if I have subcomponents defined in the declaration of  TestBed.configureTestingModule. The first test in a describe works, and all others following this test, even in another file, does not work anymore since somehow fixture = TestBed.createComponent(component); does not get executed (I assume, since fixture is undefined)</p>
  
  <p>For sure, somewhere I am doing a big mistake, but where? 
  I have here a project which you can see all the setup. </p>
  
  <p><a href="https://github.com/damirkusar/AngularMeetsNetCore/tree/AngularTesting" rel="nofollow noreferrer">https://github.com/damirkusar/AngularMeetsNetCore/tree/AngularTesting</a>
  And this class does the problem: <a href="https://github.com/damirkusar/AngularMeetsNetCore/blob/AngularTesting/WebApp/ClientApp/app/modules/navigation/navigation/navigation.spec.ts" rel="nofollow noreferrer">navigation.spec.ts</a></p>
  
  <p>This is an example of an error of a test which comes after the navigation.specs.. removing the navigation.spec tests the below test works. </p>
  
  <pre><code>    Chrome 56.0.2924 (Windows 10 0.0.0) NewsRoomComponent news property undefined FAILED
          TypeError: Cannot read property 'push' of undefined
              at karma.testshim.config.js:104193:37
              at Array.forEach (native)
              at new UniversalModule (karma.testshim.config.js:104191:16)
              at DynamicTestModuleInjector.createInternal (/DynamicTestModule/module.ngfactory.js:342:
  29)
              at DynamicTestModuleInjector.NgModuleInjector.create (karma.testshim.config.js:52595:76)
              at NgModuleFactory.create (karma.testshim.config.js:52561:18)
              at TestBed._initIfNeeded (karma.testshim.config.js:34188:82)
              at TestBed.createComponent (karma.testshim.config.js:34257:18)
              at Function.TestBed.createComponent (karma.testshim.config.js:34086:33)
              at MainSpec.init (karma.testshim.config.js:15618:42)
              at Object.&lt;anonymous&gt; (karma.testshim.config.js:111972:20)
              at ZoneDelegate.invoke (karma.testshim.config.js:83750:26)
              at ProxyZoneSpec.onInvoke (karma.testshim.config.js:83316:39)
              at ZoneDelegate.invoke (karma.testshim.config.js:83749:32)
              at Zone.run (karma.testshim.config.js:83546:43)
              at Object.&lt;anonymous&gt; (karma.testshim.config.js:83031:34)
              at ZoneQueueRunner.jasmine.QueueRunner.ZoneQueueRunner.execute (karma.testshim.config.js
  :83061:42)
              at ZoneDelegate.invokeTask (karma.testshim.config.js:83783:31)
              at Zone.runTask (karma.testshim.config.js:83586:47)
              at drainMicroTaskQueue (karma.testshim.config.js:83949:35)
          TypeError: Cannot read property 'news' of undefined
              at Object.&lt;anonymous&gt; (karma.testshim.config.js:111978:35)
              at ZoneDelegate.invoke (karma.testshim.config.js:83750:26)
              at ProxyZoneSpec.onInvoke (karma.testshim.config.js:83316:39)
              at ZoneDelegate.invoke (karma.testshim.config.js:83749:32)
              at Zone.run (karma.testshim.config.js:83546:43)
              at Object.&lt;anonymous&gt; (karma.testshim.config.js:83031:34)
              at ZoneQueueRunner.jasmine.QueueRunner.ZoneQueueRunner.execute (karma.testshim.config.js
  :83061:42)
              at ZoneDelegate.invokeTask (karma.testshim.config.js:83783:31)
              at Zone.runTask (karma.testshim.config.js:83586:47)
              at drainMicroTaskQueue (karma.testshim.config.js:83949:35)
  Chrome 56.0.2924 (Windows 10 0.0.0): Executed 12 of 12 (3 FAILED) (1.334 secs / 1.263 secs)
  npm ERR! Test failed.  See above for more details.
  </code></pre>