test

  it('should call SampleContainerComponent.submitAction()', () => {
    jest.spyOn(container, 'submitAction');

    // 子Componentのemit
    (fixture.debugElement.query(By.directive(SampleComponent)).componentInstance as SampleComponent).submitAction.emit();

    // 親Containerのmethodがcallされてるかテスト
    expect(container.submitAction).toHaveBeenCalledWith();
  })