使用 Jasmine 和 Angular 在單元測試中無法獲得 select 按鈕單擊

Question

您好，我正在使用 Angular 並嘗試為 Reactive 表單創建單元測試但無法成功

我需要什么：如何使用 angular 中的 jasmine 在表單填充了假值和真值后執行按鈕單擊。

我做了什么：我創建了一個邏輯，但它不起作用

 it('Form check is valid or not if no values entered', () => {

    expect(component.userCreationForm.valid).toBeFalsy();
  });

  it('Form check is valid or not when values entered', () => {

    component.userCreationForm.controls['firstname'].setValue('luther');
    component.userCreationForm.controls['lastname'].setValue('adams');
    component.userCreationForm.controls['email'].setValue('test@gmail.com');
    component.userCreationForm.controls['password'].setValue('123456');
    expect(component.userCreationForm.valid).toBeTruthy();
  });

  it('Form Submitted should check from is submitted', () => {
    // check form is invalid
    expect(component.userCreationForm.invalid).toBeTruthy();
    let btn = fixture.debugElement.query(By.css('button[type=submit]'));
    // Check button is disabled
    expect(btn.nativeElement.disabled).toBeTruthy();
    component.userCreationForm.controls['firstname'].setValue('luther');
    component.userCreationForm.controls['lastname'].setValue('adams');
    component.userCreationForm.controls['email'].setValue('test@gmail.com');
    component.userCreationForm.controls['password'].setValue('testpassword');
    fixture.detectChanges();
    // check button is enabled
    expect(btn.nativeElement.disabled).toBeFalsy();

    component.onUserCreation();
    fixture.detectChanges();

    let success = fixture.debugElement.query(By.css('#success-msg')).nativeElement;
    expect(success.textContent).toBe('Bubba');

 });

html邏輯

<div class="inv-buttons">
          <button mat-raised-button color="primary" [disabled]="userCreationForm.invalid" type="submit">Create User</button>
        </div>

下面是我的堆棧閃電戰： https://stackblitz.com/edit/angular-9-material-starter-q9wxvq

Answer 1

您想在哪里單擊您創建的 btn。 像下面這樣使用它：-

 btn.nativeElement.click();

我在下面更改了您的測試用例：-

it('Form Submitted should check from is submitted',async () => {
    // check form is invalid
    expect(component.userCreationForm.invalid).toBeTruthy();
    let btn = fixture.debugElement.query(By.css('button[type=submit]'));
    // Check button is disabled
    expect(btn.nativeElement.disabled).toBeTruthy();
    component.userCreationForm.controls['firstname'].setValue('luther');
    component.userCreationForm.controls['lastname'].setValue('adams');
    component.userCreationForm.controls['email'].setValue('test@gmail.com');
    component.userCreationForm.controls['password'].setValue('testpassword');
    fixture.detectChanges();
    // check button is enabled
    expect(btn.nativeElement.disabled).toBeFalsy();
    await fixture.whenStable();
    console.clear();
    btn.nativeElement.click();
    fixture.detectChanges();
    //component.onUserCreation();
    //fixture.detectChanges();

    //let success = fixture.debugElement.query(By.css('#success-msg')).nativeElement;
    //expect(success.textContent).toBe('Bubba');

 });