在开发需要和NgRx存储测试套件的组件时，我失败了，并且我收到一条消息，指出...

“无法解析NavComponent的所有参数：（？）。”

  ● AppComponent › should create the app

    Can't resolve all parameters for NavComponent: (?).

      at syntaxError (../packages/compiler/src/util.ts:100:17)
      at CompileMetadataResolver._getDependenciesMetadata (../packages/compiler/src/metadata_resolver.ts:957:27)
      at CompileMetadataResolver._getTypeMetadata (../packages/compiler/src/metadata_resolver.ts:836:20)
      at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (../packages/compiler/src/metadata_resolver.ts:377:18)
      at CompileMetadataResolver.loadDirectiveMetadata (../packages/compiler/src/metadata_resolver.ts:224:11)
      at ../packages/compiler/src/jit/compiler.ts:135:36
          at Array.forEach (<anonymous>)
      at ../packages/compiler/src/jit/compiler.ts:133:65
          at Array.forEach (<anonymous>)
      at JitCompiler._loadmodules (../packages/compiler/src/jit/compiler.ts:130:71)
      at JitCompiler._compileModuleAndAllComponents (../packages/compiler/src/jit/compiler.ts:115:32)
      at JitCompiler.compileModuleAndAllComponentsAsync (../packages/compiler/src/jit/compiler.ts:69:33)
      at CompilerImpl.compileModuleAndAllComponentsAsync (../packages/platform-browser-dynamic/src/compiler_factory.ts:69:27)
      at TestingCompilerImpl.compileModuleAndAllComponentsAsync (../../packages/platform-browser-dynamic/testing/src/compiler_factory.ts:57:27)
      at TestBedViewEngine.compileComponents (../../packages/core/testing/src/test_bed.ts:362:27)
      at Function.TestBedViewEngine.compileComponents (../../packages/core/testing/src/test_bed.ts:160:66)
      at src/app/app.component.spec.ts:32:8
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:391:26)
      at ProxyZonespec.Object.<anonymous>.ProxyZonespec.onInvoke (node_modules/zone.js/dist/proxy.js:129:39)
      at ZoneDelegate.Object.<anonymous>.ZoneDelegate.invoke (node_modules/zone.js/dist/zone.js:390:52)
      at Zone.Object.<anonymous>.Zone.run (node_modules/zone.js/dist/zone.js:150:43)

我的测试台配置

describe('AppComponent',() => {
  let router: Router;
  let location: Location;
  let store: MockStore<ApplicationState>;
  const initialState: ApplicationState = {
    root: {
      user: null,tabs: null
    }
  };

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [RouterTestingModule.withRoutes(routes),MaterialsModule],declarations: [AppComponent,NavComponent],providers: [provideMockStore({ initialState })]
    }).compileComponents();
    router = TestBed.get(Router);
    location = TestBed.get(Location);
    store = TestBed.get<Store<ApplicationState>>(Store);

    router.initialNavigation();
  });

组件

@Component({
  selector: 'af3-nav',templateUrl: './nav.component.html',styleUrls: ['./nav.component.css']
})
export class NavComponent implements OnInit {
  tabs$: Observable<NavTab[]>;
  constructor(private store: Store<fromStore.ApplicationState>) {}

  ngOnInit() {
    // this.tabs$ = this.store.pipe(select(fromStore.selectTabsForUserState));
  }
}

我也尝试导入StoreModule，但是根据ngrx.io，这是不必要的，因为provideMockStore()设置了配置reducer所需的所有提供程序。

错误和堆栈跟踪不是很有帮助。

在此先感谢您的帮助。

更新：事实证明，测试平台无法注入任何引用的服务。我创建了一个测试服务并尝试运行该测试，但是在运行测试时收到了相同的错误。

更新：NGRX绝对不是问题。为了添加更多上下文，我一直在尝试跟踪此问题。当前没有提供者可以解决。我用Jest代替了Jasmine，看来Jest可能是问题所在。