NullInjectorError: InjectionToken ToastConfig 没有提供程序！在 Angular + Electron 项目的茉莉花规范中

Question

问题

大家好！第一次在这里提问，希望得到帮助。我目前正在开发一个 Electron+Angular 应用程序，我终于准备测试所有服务和组件。在尝试启动使用 WebStorm 创建的示例规范以及组件和服务时，我面临当前错误：

NullInjectorError: StaticInjectorError(DynamicTestModule)[InjectionToken ToastConfig]: 
      StaticInjectorError(Platform: core)[InjectionToken ToastConfig]: 
        NullInjectorError: No provider for InjectionToken ToastConfig!

这是我试图运行的简单测试文件

import {TestBed} from '@angular/core/testing';
import {CognitoService} from './cognito.service';
import {ToastrModule, ToastrService} from 'ngx-toastr';

describe('CognitoService', () => {

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [ToastrModule.forRoot()],
      providers: [
        CognitoService,
        {provide: ToastrService, useClass: ToastrService}
      ]
    }).compileComponents();
  });

  it('should be created', () => {
    const service: CognitoService = TestBed.get(CognitoService);
    expect(service).toBeTruthy();
  });

});

这是我从运行测试中获得的堆栈跟踪

NullInjectorError: StaticInjectorError(DynamicTestModule)[InjectionToken ToastConfig]: 
      StaticInjectorError(Platform: core)[InjectionToken ToastConfig]: 
        NullInjectorError: No provider for InjectionToken ToastConfig!
    error properties: Object({ ngTempTokenPath: null, ngTokenPath: [ InjectionToken ToastConfig ] })
        at <Jasmine>
        at NullInjector.push../node_modules/@angular/core/fesm5/core.js.NullInjector.get (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:724:1)
        at resolveToken (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:2093:1)
        at tryResolveToken (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:2037:1)
        at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:1941:1)
        at resolveToken (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:2093:1)
        at tryResolveToken (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:2037:1)
        at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:1941:1)
        at resolveNgModuleDep (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:20895:1)
        at NgModuleRef_.push../node_modules/@angular/core/fesm5/core.js.NgModuleRef_.get (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:21584:1)
        at injectInjectorOnly (http://localhost:9876/_karma_webpack_/node_modules/@angular/core/fesm5/core.js:627:1)

这是我在解决方案中的当前应用程序模块，正如我所见，它可能取决于在此处正确导入 ToastrModule

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { TranslateLoader, TranslateModule } from '@ngx-translate/core';
import { ModalModule, TooltipModule } from 'ngx-bootstrap';
import { ToastrModule } from 'ngx-toastr';
import { LayoutModule } from './layout/layout.module';
import { HttpClient, HttpClientModule } from '@angular/common/http';
import { TranslateHttpLoader } from '@ngx-translate/http-loader';
import { BrowserAnimationsModule, NoopAnimationsModule } from '@angular/platform-browser/animations';
import { ConfirmationDialogComponent } from './shared/confirmation-dialog/confirmation-dialog.component';
import {SharedModule} from './shared/shared.module';

export function HttpLoaderFactory(http: HttpClient) {
  return new TranslateHttpLoader(http, 'assets/i18n/', '.json');
}

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    NoopAnimationsModule,
    BrowserAnimationsModule,
    AppRoutingModule,
    HttpClientModule,
    SharedModule,
    LayoutModule,
    ToastrModule.forRoot({
      positionClass: 'toast-top-full-width'
    }),
    TooltipModule.forRoot(),
    ModalModule.forRoot(),
    TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: HttpLoaderFactory,
        deps: [HttpClient]
      }
    }),
  ],
  entryComponents: [ConfirmationDialogComponent],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

我试过的

• 已验证ToastrModule.forRoot在导入部分

• 在 tsconfig.spec.json 中删除/添加了“jasmine”、“jest”，这是 tsconfig.spec.json 的扩展

  配置文件

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "./out-tsc/spec",
    "types": [
      "jasmine",
      "node"
    ]
  },
  "files": [
    "src/test.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.spec.ts",
    "src/**/*.d.ts"
  ]
}

• 尝试 npm 更新
• 尝试安装 @types/jasmine 和 @types/jest

任何帮助将不胜感激，提前致谢！

PS：如果您需要更多信息，我会尽快添加它们

Answer 1

尝试指定烤面包机的位置，否则它会给出空注入错误

app.module.ts

 imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    BrowserAnimationsModule,
    FormsModule,
    BsDropdownModule.forRoot(),
    ToastrModule.forRoot({
      positionClass :'toast-bottom-right'
    })
  ],

Answer 2

const toastrService = {
  success: (
    message?: string,
    title?: string,
    override?: Partial<IndividualConfig>
  ) => {},
  error: (
    message?: string,
    title?: string,
    override?: Partial<IndividualConfig>
  ) => {},
};

使用提供程序数组中的存根

{ provide: ToastrService, useValue: toastrService }

Answer 3

将 ToastrModule.forRoot() 添加到 my.component.spec.ts 对我有用

beforeEach(waitForAsync(() => {
  TestBed.configureTestingModule({
    declarations: [ LoginComponent ],
    imports: [
      IonicModule.forRoot(),
      ToastrModule.forRoot() // added this works for me
    ], ...