angular/packages/platform-browser/test/browser/bootstrap_spec.ts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {animate, state, style, transition, trigger} from '@angular/animations';
import {DOCUMENT, isPlatformBrowser, ɵgetDOM as getDOM} from '@angular/common';
import {ANIMATION_MODULE_TYPE, APP_INITIALIZER, Compiler, Component, createPlatformFactory, CUSTOM_ELEMENTS_SCHEMA, Directive, ErrorHandler, Inject, inject as _inject, InjectionToken, Injector, Input, LOCALE_ID, NgModule, NgModuleRef, OnDestroy, Pipe, PLATFORM_ID, PLATFORM_INITIALIZER, Provider, Sanitizer, StaticProvider, Testability, TestabilityRegistry, Type, VERSION} from '@angular/core';
import {ApplicationRef, destroyPlatform} from '@angular/core/src/application_ref';
import {Console} from '@angular/core/src/console';
import {ComponentRef} from '@angular/core/src/linker/component_factory';
import {inject, TestBed} from '@angular/core/testing';
import {Log} from '@angular/core/testing/src/testing_internal';
import {BrowserModule, TransferState} from '@angular/platform-browser';
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {provideAnimations, provideNoopAnimations} from '@angular/platform-browser/animations';
import {expect} from '@angular/platform-browser/testing/src/matchers';

import {bootstrapApplication} from '../../src/browser';

@Component({selector: 'non-existent', template: ''})
class NonExistentComp {
}

@Component({selector: 'hello-app', template: '{{greeting}} world!'})
class HelloRootCmp {
  greeting: string;
  constructor() {
    this.greeting = 'hello';
  }
}

@Component({selector: 'hello-app-2', template: '{{greeting}} world, again!'})
class HelloRootCmp2 {
  greeting: string;
  constructor() {
    this.greeting = 'hello';
  }
}

@Component({selector: 'hello-app', template: ''})
class HelloRootCmp3 {
  appBinding: any /** TODO #9100 */;

  constructor(@Inject('appBinding') appBinding: any /** TODO #9100 */) {
    this.appBinding = appBinding;
  }
}

@Component({selector: 'hello-app', template: ''})
class HelloRootCmp4 {
  appRef: any /** TODO #9100 */;

  constructor(@Inject(ApplicationRef) appRef: ApplicationRef) {
    this.appRef = appRef;
  }
}

@Directive({selector: 'hello-app'})
class HelloRootDirectiveIsNotCmp {
}

@Component({selector: 'hello-app', template: ''})
class HelloOnDestroyTickCmp implements OnDestroy {
  appRef: ApplicationRef;
  constructor(@Inject(ApplicationRef) appRef: ApplicationRef) {
    this.appRef = appRef;
  }

  ngOnDestroy(): void {
    this.appRef.tick();
  }
}

@Component({selector: 'hello-app', template: '<some-el [someProp]="true">hello world!</some-el>'})
class HelloCmpUsingCustomElement {
}

class MockConsole {
  res: any[][] = [];
  error(...s: any[]): void {
    this.res.push(s);
  }
}


class DummyConsole implements Console {
  public warnings: string[] = [];

  log(message: string) {}
  warn(message: string) {
    this.warnings.push(message);
  }
}


function bootstrap(
    cmpType: any, providers: Provider[] = [], platformProviders: StaticProvider[] = [],
    imports: Type<any>[] = []): Promise<any> {
  @NgModule({
    imports: [BrowserModule, ...imports],
    declarations: [cmpType],
    bootstrap: [cmpType],
    providers: providers,
    schemas: [CUSTOM_ELEMENTS_SCHEMA]
  })
  class TestModule {
  }
  return platformBrowserDynamic(platformProviders).bootstrapModule(TestModule);
}

{
  let el: any /** TODO #9100 */, el2: any /** TODO #9100 */, testProviders: Provider[],
      lightDom: any /** TODO #9100 */;

  describe('bootstrap factory method', () => {
    if (isNode) {
      // Jasmine will throw if there are no tests.
      it('should pass', () => {});
      return;
    }

    let compilerConsole: DummyConsole;

    beforeEach(() => {
      TestBed.configureTestingModule({providers: [Log]});
    });

    beforeEach(inject([DOCUMENT], (doc: any) => {
      destroyPlatform();
      compilerConsole = new DummyConsole();
      testProviders = [{provide: Console, useValue: compilerConsole}];

      const oldRoots = doc.querySelectorAll('hello-app,hello-app-2,light-dom-el');
      for (let i = 0; i < oldRoots.length; i++) {
        getDOM().remove(oldRoots[i]);
      }

      el = getDOM().createElement('hello-app', doc);
      el2 = getDOM().createElement('hello-app-2', doc);
      lightDom = getDOM().createElement('light-dom-el', doc);
      doc.body.appendChild(el);
      doc.body.appendChild(el2);
      el.appendChild(lightDom);
      lightDom.textContent = 'loading';
    }));

    afterEach(destroyPlatform);

    describe('bootstrapApplication', () => {
      const NAME = new InjectionToken<string>('name');
      @Component({
        standalone: true,
        selector: 'hello-app',
        template: 'Hello from {{ name }}!',
      })
      class SimpleComp {
        name = 'SimpleComp';
      }

      @Component({
        standalone: true,
        selector: 'hello-app-2',
        template: 'Hello from {{ name }}!',
      })
      class SimpleComp2 {
        name = 'SimpleComp2';
      }

      @Component({
        standalone: true,
        selector: 'hello-app',
        template: 'Hello from {{ name }}!',
      })
      class ComponentWithDeps {
        constructor(@Inject(NAME) public name: string) {}
      }

      @Component({
        selector: 'hello-app-2',
        template: 'Hello from {{ name }}!',
      })
      class NonStandaloneComp {
        name = 'NonStandaloneComp';
      }

      @NgModule({
        declarations: [NonStandaloneComp],
      })
      class NonStandaloneCompModule {
      }

      it('should work for simple standalone components', async () => {
        await bootstrapApplication(SimpleComp);
        expect(el.innerText).toBe('Hello from SimpleComp!');
      });

      it('should allow passing providers during the bootstrap', async () => {
        const providers = [{provide: NAME, useValue: 'Name via DI'}];
        await bootstrapApplication(ComponentWithDeps, {providers});
        expect(el.innerText).toBe('Hello from Name via DI!');
      });

      it('should reuse existing platform', async () => {
        const platformProviders = [{provide: NAME, useValue: 'Name via DI (Platform level)'}];
        platformBrowserDynamic(platformProviders);

        await bootstrapApplication(ComponentWithDeps);
        expect(el.innerText).toBe('Hello from Name via DI (Platform level)!');
      });

      it('should allow bootstrapping multiple apps', async () => {
        await bootstrapApplication(SimpleComp);
        await bootstrapApplication(SimpleComp2);

        expect(el.innerText).toBe('Hello from SimpleComp!');
        expect(el2.innerText).toBe('Hello from SimpleComp2!');
      });

      it('should keep change detection isolated for separately bootstrapped apps', async () => {
        const appRef1 = await bootstrapApplication(SimpleComp);
        const appRef2 = await bootstrapApplication(SimpleComp2);

        expect(el.innerText).toBe('Hello from SimpleComp!');
        expect(el2.innerText).toBe('Hello from SimpleComp2!');

        // Update name in both components, but trigger change detection only in the first one.
        appRef1.components[0].instance.name = 'Updated SimpleComp';
        appRef2.components[0].instance.name = 'Updated SimpleComp2';

        // Trigger change detection for the first app.
        appRef1.tick();

        // Expect that the first component content is updated, but the second one remains the same.
        expect(el.innerText).toBe('Hello from Updated SimpleComp!');
        expect(el2.innerText).toBe('Hello from SimpleComp2!');

        // Trigger change detection for the second app.
        appRef2.tick();

        // Now the second component should be updated as well.
        expect(el.innerText).toBe('Hello from Updated SimpleComp!');
        expect(el2.innerText).toBe('Hello from Updated SimpleComp2!');
      });

      it('should allow bootstrapping multiple standalone components within the same app',
         async () => {
           const appRef = await bootstrapApplication(SimpleComp);
           appRef.bootstrap(SimpleComp2);

           expect(el.innerText).toBe('Hello from SimpleComp!');
           expect(el2.innerText).toBe('Hello from SimpleComp2!');

           // Update name in both components.
           appRef.components[0].instance.name = 'Updated SimpleComp';
           appRef.components[1].instance.name = 'Updated SimpleComp2';

           // Run change detection for the app.
           appRef.tick();

           // Expect both components to be updated, since they belong to the same app.
           expect(el.innerText).toBe('Hello from Updated SimpleComp!');
           expect(el2.innerText).toBe('Hello from Updated SimpleComp2!');
         });

      it('should allow bootstrapping non-standalone components within the same app', async () => {
        const appRef = await bootstrapApplication(SimpleComp);

        // ApplicationRef should still allow bootstrapping non-standalone
        // components into the same application.
        appRef.bootstrap(NonStandaloneComp);

        expect(el.innerText).toBe('Hello from SimpleComp!');
        expect(el2.innerText).toBe('Hello from NonStandaloneComp!');

        // Update name in both components.
        appRef.components[0].instance.name = 'Updated SimpleComp';
        appRef.components[1].instance.name = 'Updated NonStandaloneComp';

        // Run change detection for the app.
        appRef.tick();

        // Expect both components to be updated, since they belong to the same app.
        expect(el.innerText).toBe('Hello from Updated SimpleComp!');
        expect(el2.innerText).toBe('Hello from Updated NonStandaloneComp!');
      });

      it('should throw when trying to bootstrap a non-standalone component', () => {
        const msg = 'NG0907: The NonStandaloneComp component is not marked as standalone, ' +
            'but Angular expects to have a standalone component here. Please make sure the ' +
            'NonStandaloneComp component has the `standalone: true` flag in the decorator.';
        expect(() => bootstrapApplication(NonStandaloneComp)).toThrowError(msg);
      });

      it('should throw when trying to bootstrap a standalone directive', () => {
        @Directive({
          standalone: true,
          selector: '[dir]',
        })
        class StandaloneDirective {
        }

        const msg =  //
            'NG0906: The StandaloneDirective is not an Angular component, ' +
            'make sure it has the `@Component` decorator.';
        expect(() => bootstrapApplication(StandaloneDirective)).toThrowError(msg);
      });

      it('should throw when trying to bootstrap a non-annotated class', () => {
        class NonAnnotatedClass {}
        const msg =  //
            'NG0906: The NonAnnotatedClass is not an Angular component, ' +
            'make sure it has the `@Component` decorator.';
        expect(() => bootstrapApplication(NonAnnotatedClass)).toThrowError(msg);
      });

      it('should have the TransferState token available', async () => {
        let state: TransferState|undefined;
        @Component({
          selector: 'hello-app',
          standalone: true,
          template: '...',
        })
        class StandaloneComponent {
          constructor() {
            state = _inject(TransferState);
          }
        }

        await bootstrapApplication(StandaloneComponent);
        expect(state).toBeInstanceOf(TransferState);
      });

      describe('with animations', () => {
        @Component({
          standalone: true,
          selector: 'hello-app',
          template: `
            <div
              @myAnimation
              (@myAnimation.start)="onStart($event)">Hello from AnimationCmp!</div>`,
          animations: [trigger(
              'myAnimation', [transition('void => *', [style({opacity: 1}), animate(5)])])],
        })
        class AnimationCmp {
          renderer = _inject(ANIMATION_MODULE_TYPE, {optional: true}) ?? 'not found';
          startEvent?: {};
          onStart(event: {}) {
            this.startEvent = event;
          }
        }

        it('should enable animations when using provideAnimations()', async () => {
          const appRef = await bootstrapApplication(AnimationCmp, {
            providers: [provideAnimations()],
          });
          const cmp = appRef.components[0].instance;

          // Wait until animation is completed.
          await new Promise(resolve => setTimeout(resolve, 10));

          expect(cmp.renderer).toBe('BrowserAnimations');
          expect(cmp.startEvent.triggerName).toEqual('myAnimation');
          expect(cmp.startEvent.phaseName).toEqual('start');

          expect(el.innerText).toBe('Hello from AnimationCmp!');
        });

        it('should use noop animations renderer when using provideNoopAnimations()', async () => {
          const appRef = await bootstrapApplication(AnimationCmp, {
            providers: [provideNoopAnimations()],
          });
          const cmp = appRef.components[0].instance;

          // Wait until animation is completed.
          await new Promise(resolve => setTimeout(resolve, 10));

          expect(cmp.renderer).toBe('NoopAnimations');
          expect(cmp.startEvent.triggerName).toEqual('myAnimation');
          expect(cmp.startEvent.phaseName).toEqual('start');

          expect(el.innerText).toBe('Hello from AnimationCmp!');
        });
      });
    });

    it('should throw if bootstrapped Directive is not a Component', done => {
      const logger = new MockConsole();
      const errorHandler = new ErrorHandler();
      (errorHandler as any)._console = logger as any;
      bootstrap(HelloRootDirectiveIsNotCmp, [
        {provide: ErrorHandler, useValue: errorHandler}
      ]).catch((error: Error) => {
        expect(error).toEqual(
            new Error(`HelloRootDirectiveIsNotCmp cannot be used as an entry component.`));
        done();
      });
    });

    it('should have the TransferState token available in NgModule bootstrap', async () => {
      let state: TransferState|undefined;
      @Component({
        selector: 'hello-app',
        template: '...',
      })
      class NonStandaloneComponent {
        constructor() {
          state = _inject(TransferState);
        }
      }

      await bootstrap(NonStandaloneComponent);
      expect(state).toBeInstanceOf(TransferState);
    });

    it('should retrieve sanitizer', inject([Injector], (injector: Injector) => {
         const sanitizer: Sanitizer|null = injector.get(Sanitizer, null);
         // We don't want to have sanitizer in DI. We use DI only to overwrite the
         // sanitizer, but not for default one. The default one is pulled in by the Ivy
         // instructions as needed.
         expect(sanitizer).toBe(null);
       }));

    it('should throw if no element is found', done => {
      const logger = new MockConsole();
      const errorHandler = new ErrorHandler();
      (errorHandler as any)._console = logger as any;
      bootstrap(NonExistentComp, [
        {provide: ErrorHandler, useValue: errorHandler}
      ]).then(null, (reason) => {
        expect(reason.message).toContain('The selector "non-existent" did not match any elements');
        done();
        return null;
      });
    });

    it('should throw if no provider', done => {
      const logger = new MockConsole();
      const errorHandler = new ErrorHandler();
      (errorHandler as any)._console = logger as any;

      class IDontExist {}

      @Component({selector: 'cmp', template: 'Cmp'})
      class CustomCmp {
        constructor(iDontExist: IDontExist) {}
      }

      @Component({
        selector: 'hello-app',
        template: '<cmp></cmp>',
      })
      class RootCmp {
      }

      @NgModule({declarations: [CustomCmp], exports: [CustomCmp]})
      class CustomModule {
      }

      bootstrap(RootCmp, [{provide: ErrorHandler, useValue: errorHandler}], [], [
        CustomModule
      ]).then(null, (e: Error) => {
        const errorMsg = `R3InjectorError(TestModule)[IDontExist -> IDontExist -> IDontExist]: \n`;
        expect(e.message).toContain(errorMsg);
        done();
        return null;
      });
    });

    if (getDOM().supportsDOMEvents) {
      it('should forward the error to promise when bootstrap fails', done => {
        const logger = new MockConsole();
        const errorHandler = new ErrorHandler();
        (errorHandler as any)._console = logger as any;

        const refPromise =
            bootstrap(NonExistentComp, [{provide: ErrorHandler, useValue: errorHandler}]);
        refPromise.then(null, (reason: any) => {
          expect(reason.message)
              .toContain('The selector "non-existent" did not match any elements');
          done();
        });
      });

      it('should invoke the default exception handler when bootstrap fails', done => {
        const logger = new MockConsole();
        const errorHandler = new ErrorHandler();
        (errorHandler as any)._console = logger as any;

        const refPromise =
            bootstrap(NonExistentComp, [{provide: ErrorHandler, useValue: errorHandler}]);
        refPromise.then(null, (reason) => {
          expect(logger.res[0].join('#'))
              .toContain('ERROR#Error: The selector "non-existent" did not match any elements');
          done();
          return null;
        });
      });
    }

    it('should create an injector promise', async () => {
      const refPromise = bootstrap(HelloRootCmp, testProviders);
      expect(refPromise).toEqual(jasmine.any(Promise));
      await refPromise;  // complete component initialization before switching to the next test
    });

    it('should set platform name to browser', done => {
      const refPromise = bootstrap(HelloRootCmp, testProviders);
      refPromise.then((ref) => {
        expect(isPlatformBrowser(ref.injector.get(PLATFORM_ID))).toBe(true);
        done();
      }, done.fail);
    });

    it('should display hello world', done => {
      const refPromise = bootstrap(HelloRootCmp, testProviders);
      refPromise.then((ref) => {
        expect(el).toHaveText('hello world!');
        expect(el.getAttribute('ng-version')).toEqual(VERSION.full);
        done();
      }, done.fail);
    });

    it('should throw a descriptive error if BrowserModule is installed again via a lazily loaded module',
       done => {
         @NgModule({imports: [BrowserModule]})
         class AsyncModule {
         }
         bootstrap(HelloRootCmp, testProviders)
             .then((ref: ComponentRef<HelloRootCmp>) => {
               const compiler: Compiler = ref.injector.get(Compiler);
               return compiler.compileModuleAsync(AsyncModule).then(factory => {
                 expect(() => factory.create(ref.injector))
                     .toThrowError(
                         'Providers from the `BrowserModule` have already been loaded. ' +
                         'If you need access to common directives such as NgIf and NgFor, ' +
                         'import the `CommonModule` instead.');
               });
             })
             .then(() => done(), err => done.fail(err));
       });

    it('should support multiple calls to bootstrap', done => {
      const refPromise1 = bootstrap(HelloRootCmp, testProviders);
      const refPromise2 = bootstrap(HelloRootCmp2, testProviders);
      Promise.all([refPromise1, refPromise2]).then((refs) => {
        expect(el).toHaveText('hello world!');
        expect(el2).toHaveText('hello world, again!');
        done();
      }, done.fail);
    });

    it('should not crash if change detection is invoked when the root component is disposed',
       done => {
         bootstrap(HelloOnDestroyTickCmp, testProviders).then((ref) => {
           expect(() => ref.destroy()).not.toThrow();
           done();
         });
       });

    it('should unregister change detectors when components are disposed', done => {
      bootstrap(HelloRootCmp, testProviders).then((ref) => {
        const appRef = ref.injector.get(ApplicationRef);
        ref.destroy();
        expect(() => appRef.tick()).not.toThrow();
        done();
      }, done.fail);
    });

    it('should make the provided bindings available to the application component', done => {
      const refPromise = bootstrap(
          HelloRootCmp3, [testProviders, {provide: 'appBinding', useValue: 'BoundValue'}]);

      refPromise.then((ref) => {
        expect(ref.injector.get('appBinding')).toEqual('BoundValue');
        done();
      }, done.fail);
    });

    it('should not override locale provided during bootstrap', done => {
      const refPromise =
          bootstrap(HelloRootCmp, [testProviders], [{provide: LOCALE_ID, useValue: 'fr-FR'}]);

      refPromise.then(ref => {
        expect(ref.injector.get(LOCALE_ID)).toEqual('fr-FR');
        done();
      }, done.fail);
    });

    it('should avoid cyclic dependencies when root component requires Lifecycle through DI',
       done => {
         const refPromise = bootstrap(HelloRootCmp4, testProviders);

         refPromise.then((ref) => {
           const appRef = ref.injector.get(ApplicationRef);
           expect(appRef).toBeDefined();
           done();
         }, done.fail);
       });

    it('should run platform initializers', done => {
      inject([Log], (log: Log) => {
        const p = createPlatformFactory(platformBrowserDynamic, 'someName', [
          {provide: PLATFORM_INITIALIZER, useValue: log.fn('platform_init1'), multi: true},
          {provide: PLATFORM_INITIALIZER, useValue: log.fn('platform_init2'), multi: true}
        ])();

        @NgModule({
          imports: [BrowserModule],
          providers: [
            {provide: APP_INITIALIZER, useValue: log.fn('app_init1'), multi: true},
            {provide: APP_INITIALIZER, useValue: log.fn('app_init2'), multi: true}
          ]
        })
        class SomeModule {
          ngDoBootstrap() {}
        }

        expect(log.result()).toEqual('platform_init1; platform_init2');
        log.clear();
        p.bootstrapModule(SomeModule).then(() => {
          expect(log.result()).toEqual('app_init1; app_init2');
          done();
        }, done.fail);
      })();
    });

    it('should remove styles when transitioning from a server render', done => {
      @Component({
        selector: 'root',
        template: 'root',
      })
      class RootCmp {
      }

      @NgModule({
        bootstrap: [RootCmp],
        declarations: [RootCmp],
        imports: [BrowserModule.withServerTransition({appId: 'my-app'})],
      })
      class TestModule {
      }

      // First, set up styles to be removed.
      const dom = getDOM();
      const platform = platformBrowserDynamic();
      const document = platform.injector.get(DOCUMENT);
      const style = dom.createElement('style', document);
      style.setAttribute('ng-transition', 'my-app');
      document.head.appendChild(style);

      const root = dom.createElement('root', document);
      document.body.appendChild(root);

      platform.bootstrapModule(TestModule).then(() => {
        const styles: HTMLElement[] =
            Array.prototype.slice.apply(document.getElementsByTagName('style') || []);
        styles.forEach(style => {
          expect(style.getAttribute('ng-transition')).not.toBe('my-app');
        });
        done();
      }, done.fail);
    });

    it('should register each application with the testability registry', async () => {
      const ngModuleRef1: NgModuleRef<unknown> = await bootstrap(HelloRootCmp, testProviders);
      const ngModuleRef2: NgModuleRef<unknown> = await bootstrap(HelloRootCmp2, testProviders);

      // The `TestabilityRegistry` is provided in the "platform", so the same instance is available
      // to both `NgModuleRef`s and it can be retrieved from any ref (we use the first one).
      const registry = ngModuleRef1.injector.get(TestabilityRegistry);

      expect(registry.findTestabilityInTree(el)).toEqual(ngModuleRef1.injector.get(Testability));
      expect(registry.findTestabilityInTree(el2)).toEqual(ngModuleRef2.injector.get(Testability));
    });

    it('should allow to pass schemas', done => {
      bootstrap(HelloCmpUsingCustomElement, testProviders).then(() => {
        expect(el).toHaveText('hello world!');
        done();
      }, done.fail);
    });

    describe('change detection', () => {
      const log: string[] = [];
      @Component({
        selector: 'hello-app',
        template: '<div id="button-a" (click)="onClick()">{{title}}</div>',
      })
      class CompA {
        title: string = '';
        ngDoCheck() {
          log.push('CompA:ngDoCheck');
        }
        onClick() {
          this.title = 'CompA';
          log.push('CompA:onClick');
        }
      }

      @Component({
        selector: 'hello-app-2',
        template: '<div id="button-b" (click)="onClick()">{{title}}</div>',
      })
      class CompB {
        title: string = '';
        ngDoCheck() {
          log.push('CompB:ngDoCheck');
        }
        onClick() {
          this.title = 'CompB';
          log.push('CompB:onClick');
        }
      }

      it('should be triggered for all bootstrapped components in case change happens in one of them',
         done => {
           @NgModule({
             imports: [BrowserModule],
             declarations: [CompA, CompB],
             bootstrap: [CompA, CompB],
             schemas: [CUSTOM_ELEMENTS_SCHEMA]
           })
           class TestModuleA {
           }
           platformBrowserDynamic().bootstrapModule(TestModuleA).then((ref) => {
             log.length = 0;
             el.querySelectorAll('#button-a')[0].click();
             expect(log).toContain('CompA:onClick');
             expect(log).toContain('CompA:ngDoCheck');
             expect(log).toContain('CompB:ngDoCheck');

             log.length = 0;
             el2.querySelectorAll('#button-b')[0].click();
             expect(log).toContain('CompB:onClick');
             expect(log).toContain('CompA:ngDoCheck');
             expect(log).toContain('CompB:ngDoCheck');

             done();
           }, done.fail);
         });


      it('should work in isolation for each component bootstrapped individually', done => {
        const refPromise1 = bootstrap(CompA);
        const refPromise2 = bootstrap(CompB);
        Promise.all([refPromise1, refPromise2]).then((refs) => {
          log.length = 0;
          el.querySelectorAll('#button-a')[0].click();
          expect(log).toContain('CompA:onClick');
          expect(log).toContain('CompA:ngDoCheck');
          expect(log).not.toContain('CompB:ngDoCheck');

          log.length = 0;
          el2.querySelectorAll('#button-b')[0].click();
          expect(log).toContain('CompB:onClick');
          expect(log).toContain('CompB:ngDoCheck');
          expect(log).not.toContain('CompA:ngDoCheck');

          done();
        }, done.fail);
      });
    });
  });
}