单元测试“角材料”对话框-如何包含MAT_DIALOG_DATA

Question

我正在尝试对该材质对话框进行单元测试，以测试模板是否正在渲染正确的注入对象。正确使用该组件即可正常工作

组件-对话框

export class ConfirmationDialogComponent {

  constructor(@Inject(MAT_DIALOG_DATA) private dialogModel: ConfirmationDialogModel) {}
}

对话框模板

<h1 mat-dialog-title *ngIf="dialogModel.Title">{{dialogModel.Title}}</h1>
<div mat-dialog-content>
  {{dialogModel.SupportingText}}
</div>
<div mat-dialog-actions>
  <button mat-button color="primary" [mat-dialog-close]="false">Cancel</button>
  <button mat-raised-button color="primary"[mat-dialog-close]="true" cdkFocusInitial>{{dialogModel.ActionButton}}</button>
</div>

模型-正在注入什么

export interface ConfirmationDialogModel {
  Title?: string;
  SupportingText: string;
  ActionButton: string;
}

单元测试-问题出在哪里

describe('Confirmation Dialog Component', () => {

  const model: ConfirmationDialogModel = {
    ActionButton: 'Delete',
    SupportingText: 'Are you sure?',
  };

  let component: ConfirmationDialogComponent;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [
        ConfirmationDialogComponent
      ],
      imports: [
        MatButtonModule,
        MatDialogModule
      ],
      providers: [
        {
          // I was expecting this will pass the desired value
          provide: MAT_DIALOG_DATA,
          useValue: model
        }
      ]
    });

    component = TestBed.get(ConfirmationDialogComponent);
  }));

  it('should be created', async(() => {
    expect(component).toBeTruthy();
  }));
});

因果错误

Answer 1

尝试这个：

describe('Confirmation Dialog Component', () => {

  const model: ConfirmationDialogModel = {
    ActionButton: 'Delete',
    SupportingText: 'Are you sure?',
  };

  let component: ConfirmationDialogComponent;
  let fixture: ComponentFixture<ConfirmationDialogComponent>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [
        ConfirmationDialogComponent
      ],
      imports: [
        MatButtonModule,
        MatDialogModule
      ],
      providers: [
        {
          // I was expecting this will pass the desired value
          provide: MAT_DIALOG_DATA,
          useValue: model
        }
      ]
    })
      .compileComponents();

  }));


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

  it('should be created', async(() => {
    expect(component).toBeTruthy();
  }));
});

Answer 2

以下是如何MAT_DIALOG_DATA在单元测试中注入的示例：

 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
 import { MatDialogModule, MAT_DIALOG_DATA } from '@angular/material/dialog';

 import { ConfirmDialogComponent } from './confirm-dialog.component';

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

   beforeEach(async(() => {
     TestBed.configureTestingModule({
       declarations: [ ConfirmDialogComponent ],
       imports: [ MatDialogModule ], // add here
       providers: [
        { provide: MAT_DIALOG_DATA, useValue: {} } // add here
      ],
    })
    .compileComponents();
  }));

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

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