Using platform directives doesn't work with testing dart #6598

~/C/n/angular.io-displaying-data (master) $ grind test
grinder running [test]

[test]
  pub run test:test --reporter=expanded --platform=content-shell --pub-serve=3000
writeFrom failed, path = '' (OS Error: Broken pipe, errno = 32)
  00:00 +0: test/e2e_test.dart: Displaying Data Tests should display correct title: Tour of Heroes
  00:00 +0 -1: test/e2e_test.dart: Displaying Data Tests should display correct title: Tour of Heroes
    Template parse errors:
    Property binding ngForOf not used by any directive on an embedded template ("
          <p>Heroes:</p>
          <ul>
            [ERROR ->]<li *ngFor="#hero of heroes">
              {{ hero.name }}
            </li>
    "): AppComponent@4:8
    Property binding ngIf not used by any directive on an embedded template ("
            </li>
          </ul>
          [ERROR ->]<p *ngIf="heroes.length > 3">There are many heroes!</p>
        "): AppComponent@8:6
    package:angular2/src/compiler/template_parser.dart 118:7               TemplateParser.parse
    package:angular2/src/compiler/template_compiler.dart 206:51            TemplateCompiler._compileComponentRuntime.<fn>
    ===== asynchronous gap ===========================
    dart:async                                                             _Future.then
    package:angular2/src/compiler/template_compiler.dart 202:12            TemplateCompiler._compileComponentRuntime
    package:angular2/src/compiler/template_compiler.dart 247:10            TemplateCompiler._compileNestedComponentRuntime
    package:angular2/src/compiler/template_compiler.dart 215:14            TemplateCompiler._compileComponentRuntime.<fn>.<fn>
    dart:core                                                              List.forEach
    package:angular2/src/compiler/template_compiler.dart 214:35            TemplateCompiler._compileComponentRuntime.<fn>
    ===== asynchronous gap ===========================
    dart:async                                                             _Future.then
    package:angular2/src/compiler/template_compiler.dart 202:12            TemplateCompiler._compileComponentRuntime
    package:angular2/src/compiler/template_compiler.dart 130:12            TemplateCompiler.compileHostComponentRuntime
    package:angular2/src/compiler/runtime_compiler.dart 26:10              RuntimeCompiler_.compileInHost
    package:angular2/src/core/linker/dynamic_component_loader.dart 260:27  DynamicComponentLoader_.loadAsRoot
    package:angular2/src/testing/test_component_builder.dart 247:10        TestComponentBuilder.createAsync
    e2e_test.dart 21:32                                                    main.<fn>.<fn>.<async>
    ===== asynchronous gap ===========================
    dart:async                                                             Future.Future.microtask
    e2e_test.dart                                                          main.<fn>.<fn>
    dart:core                                                              Function.apply
    package:angular2/src/facade/lang.dart 232:21                           FunctionWrapper.apply
    package:angular2/src/testing/test_injector.dart 256:28                 FunctionWithParamTokens.execute
    package:angular2/src/testing/test_injector.dart 163:15                 TestInjector.execute
    package:angular2_testing/angular2_testing.dart 83:24                   _runInjectableFunction
    package:angular2_testing/angular2_testing.dart 115:11                  ngTest.<fn>.<async>
    ===== asynchronous gap ===========================
    dart:async                                                             Future.Future.microtask
    package:angular2_testing/angular2_testing.dart                         ngTest.<fn>

  00:00 +0 -1: Some tests failed.

failed with exit code 1

@Component(
    selector: 'my-app',
    template: '''
      <h1 (click)="null">{{title}}</h1>
      <h2>My favorite hero is: {{myHero.name}}</h2>
      <p>Heroes:</p>
      <ul>
        <li *ngFor="#hero of heroes">
          {{ hero.name }}
        </li>
      </ul>
      <p *ngIf="heroes.length > 3">There are many heroes!</p>
    ''',
    directives: const [CORE_DIRECTIVES])