message: test(plugins-flow-client): fix broken test cases
  Add isReturnType flag to mock test activities
  import StoreModule, as TaskAddComponent which is dynamically injected has a child component depending on Store
diff: import { async, ComponentFixture, TestBed } from '@angular/core/testing';
  import { By } from '@angular/platform-browser';
  import { of } from 'rxjs';
  +import { StoreModule } from '@ngrx/store';
  import { CONTRIB_REFS } from '@flogo-web/core';
  import { ContributionsService } from '@flogo-web/lib-client/core';
  import { FakeRootLanguageModule } from '@flogo-web/lib-client/language/testing';
  +import { ContribInstallerService } from '@flogo-web/lib-client/contrib-installer';
  +import { ModalService } from '@flogo-web/lib-client/modal';
  import { FlogoFlowService } from '../core';
  import { TASKADD_OPTIONS, TaskAddComponent } from './task-add.component';
  import { TaskAddModule } from './task-add.module';
  import { TaskAddOptions } from './core/task-add-options';
  -import { ContribInstallerService } from '@flogo-web/lib-client/contrib-installer';
  -import { ModalService } from '@flogo-web/lib-client/modal';
  +import { featureReducer } from '../core/state';
  describe('Component: TaskAddComponent', () => {
  let component: TaskAddComponent;
  @@ -22,14 +24,17 @@ describe('Component: TaskAddComponent', () => {
  {
  ref: 'some_path_to_repo/activity/log',
  title: 'Log message',
  + isReturnType: false,
  },
  {
  ref: 'some_path_to_repo/activity/counter',
  title: 'Counter',
  + isReturnType: false,
  },
  {
  ref: CONTRIB_REFS.SUBFLOW,
  title: 'Start a subflow',
  + isReturnType: false,
  },
  ]),
  appAndFlowInfo$: of({
  @@ -50,7 +55,11 @@ describe('Component: TaskAddComponent', () => {
  beforeEach(async(() => {
  TestBed.configureTestingModule({
  - imports: [FakeRootLanguageModule, TaskAddModule],
  + imports: [FakeRootLanguageModule, TaskAddModule,
  + StoreModule.forRoot({
  + flow: featureReducer,
  + }),
  + ],
  providers: [
  {
  provide: TASKADD_OPTIONS,
  