Angular 7 测试：NullInjectorError：ActivatedRoute 没有提供者

Question

您好，在测试我使用 Angular 7 制作的应用时出现了一些错误。我在 Angular 方面没有太多经验，所以我需要您的帮助+

Error: StaticInjectorError(DynamicTestModule)[BeerDetailsComponent -> ActivatedRoute]: 
  StaticInjectorError(Platform: core)[BeerDetailsComponent -> ActivatedRoute]: 
    NullInjectorError: No provider for ActivatedRoute!

测试代码是这样的：

import { async, ComponentFixture, TestBed, inject } from '@angular/core/testing';
import { BeerDetailsComponent } from './beer-details.component';
import {
  HttpClientTestingModule,
  HttpTestingController
} from '@angular/common/http/testing';

describe('BeerDetailsComponent', () => {
  let component: BeerDetailsComponent;
  let fixture: ComponentFixture<BeerDetailsComponent>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      declarations: [ BeerDetailsComponent ]
    })
    .compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(BeerDetailsComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create',
  inject(
    [HttpTestingController],
    () => {
      expect(component).toBeTruthy();
    }
  )
)
});

我真的找不到任何解决方案。

丹尼尔

Answer 1

您必须导入 RouterTestingModule

import { RouterTestingModule } from "@angular/router/testing";

imports: [
    ...
    RouterTestingModule
    ...
]

Answer 2

添加以下导入

  imports: [ 
    RouterModule.forRoot([]),
    ...
  ],

Answer 3

我在测试时也有一段时间遇到这个错误，这些答案都没有真正帮助我。 为我解决的问题是同时导入 RouterTestingModule 和 HttpClientTestingModule。

所以基本上它在你的whatever.component.spec.ts文件中看起来像这样。

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ProductComponent],
      imports: [RouterTestingModule, HttpClientTestingModule],
    }).compileComponents();
  }));

您可以从

import { RouterTestingModule } from "@angular/router/testing";
import { HttpClientTestingModule } from "@angular/common/http/testing";

我不知道这是否是最好的解决方案，但这对我有用。

Answer 4

此问题可以通过以下方式修复：

1. 在您相应的spec.ts文件中导入 RouterTestingModule

   import { RouterTestingModule } from '@angular/router/testing';

2. 在同一个文件中添加RouterTestingModule作为导入之一

    beforeEach(() => { TestBed.configureTestingModule({ imports: [RouterTestingModule], providers: [Service] }); });

Answer 5

使用服务和 ActivatedRoute 的简单测试示例！ 祝你好运！

    import { async, ComponentFixture, TestBed } from '@angular/core/testing';
    import { RouterTestingModule } from '@angular/router/testing';
    import { HttpClientModule } from '@angular/common/http';
    import { MyComponent } from './my.component';
    import { ActivatedRoute } from '@angular/router';
    import { MyService } from '../../core/services/my.service';


    describe('MyComponent class test', () => {
    let component: MyComponent;
    let fixture: ComponentFixture<MyComponent>;
    let teste: MyComponent;
    let route: ActivatedRoute;
    let myService: MyService;

    beforeEach(async(() => {
        teste = new MyComponent(route, myService);
        TestBed.configureTestingModule({
        declarations: [ MyComponent ],
        imports: [
            RouterTestingModule,
            HttpClientModule
        ],
        providers: [MyService]
        })
        .compileComponents();
    }));

    beforeEach(() => {
        fixture = TestBed.createComponent(MyComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
    });

    it('Checks if the class was created', () => {
        expect(component).toBeTruthy();
    });

    });