ng 测试给出组件应该创建

Question

我已经在 Angular 6 中编写了我的第一个 angular 应用程序。

我还没有编写任何测试，但是在生成 components 和 services 时会自动创建一些默认测试文件。

当我运行使用

自动生成测试时

ng test

错误太多。其中一个错误是

ChangeAvatarModalComponent should create

Failed: Template parse errors:
There is no directive with "exportAs" set to "ngForm" ("
<div class="modal-body">

  <form [formGroup]="changeAvatarForm" id="avatar-form" [ERROR ->]#formDir="ngForm" (submit)="onSubmit()">
  <div class="row">
    <div class="col-md-12">
"): ng:///DynamicTestModule/ChangeAvatarModalComponent.html@8:56
Can't bind to 'formGroup' since it isn't a known property of 'form'. ("
<div class="modal-body">

我有一个 account 模块，其中有 ChangeAvatarModalComponent.

我里面有以下几行 account.module.ts

@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    ReactiveFormsModule,
    RouterModule.forChild(AccountRoutes),
    NgbModule
  ],
  declarations: [
    ChangeAvatarModalComponent
  ],
  entryComponents: [
    ChangeAvatarModalComponent
  ]
})
export class AccountModule { }

并且 FormsModule 和 ReactiveFormsModule 被导入 app.module.ts

生成的日志中有很多这样的错误。

Edit 2: change-avatar-modal.component.spec.ts

import { async, ComponentFixture, TestBed } from '@angular/core/testing';

import { ChangeAvatarModalComponent } from './change-avatar-modal.component';

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

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ ChangeAvatarModalComponent ]
    })
    .compileComponents();
  }));

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

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

Answer 1

您没有在您提供的代码中显示 .spec.ts 文件。

您遇到表单问题的原因是因为在您的规范文件中您也需要像这样导入相关模块：

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

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        RouterTestingModule,
        TranslateModule.forRoot({
          loader: {provide: TranslateLoader, useClass: TranslateFakeLoader}
        }),
        HttpClientModule,
        HttpClientTestingModule,
        FormsModule,
        SfFormModule,
        ReactiveFormsModule,
        NguiAutoCompleteModule,
        NgxMyDatePickerModule,
        NgxPermissionsModule.forRoot(),
        PipeModule,
        StoreModule.forRoot({}),
        LayoutsModule
      ],
      declarations: [
        ExampleComponent
      ],
      providers: [
        {provide: APP_BASE_HREF, useValue: '/'},
        {provide: ToastrService, MockToastrService},
        ActionsSubject,
        SimService
      ]
    }).compileComponents()
  }))

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

  it('should create', () => {
    expect(component).toBeTruthy()
  })
})

在你的情况下，你需要在你的规范文件中导入 FormsModule and/or ReactiveFormsModule 并尝试其他东西。

为了减少导入次数，您可以只将自己的模块导入规范文件中 - 例如AccountModule and/or AppModule - 因为这些已经导入了表单内容。

ng 测试给出组件应该创建

ng test gives Component should create

angular

angular6

angular-test