angular - NullInjectorError : StaticInjectorError(DynamicTestModule)[ToastrService -> InjectionToken ToastConfig]: in tslint angular 8

Question

当我在 Angular 8 项目中运行单元测试时，我在 ngx-toastr 中发现了一个错误

NullInjectorError: StaticInjectorError(DynamicTestModule)[ToastrService -> InjectionToken ToastConfig]:

我在 spec.ts 文件中导入了所需的模块，并且我在 app.module.ts 中声明了 forRoot()

  beforeEach(async(() => {
TestBed.configureTestingModule({
  imports: [MatTabsModule,
    ReactiveFormsModule,
    MatTooltipModule,
    HttpClientTestingModule,
    RouterTestingModule,
    ToastrModule
  ],
  declarations: [CommunicationComponent],
  providers: [
    ToastrService,
  ]
})
  .compileComponents();

}));

Answer 1

从'ngx-toastr'导入{ToastrModule}；

beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [ToastrModule.forRoot()],

    })
      .compileComponents();
  }));

如上所示在导入中添加 ToastrModule.forRoot() ，您的错误可能会得到解决