Angular 的 FormControl 方法 markAsTouched 在测试用例中不起作用

Question

我有这个函数来检查password和confirmPassword字段是否具有相同的值。如果没有，该表格将被标记为invalid

confirmPasswordValidator(passwordGroupForm: AbstractControl){

    let password = passwordGroupForm.get('password');
    let confirmPassword = passwordGroupForm.get('confirmPassword');
    console.log("password is "+password +"and confirmPassword is "+confirmPassword);


    console.log("confirm password touched",confirmPassword.touched );
    if(!confirmPassword.touched) return null ;//don't mark form invalid if the user hasn't interacted with confirmPassword field
    else {
      return (password.value === confirmPassword.value) ? null : {
          confirmPasswordValidator: {
            valid: false,
            message: 'Password and Verify Password fields do not match'
          }
        }
      }
    }

我编写了以下测试用例来检查该功能是否有效。

it('should not submit form if password and confirm password are not the same',()=>{
    let formControls = component.signupForm.controls;
    let userService = TestBed.get(UserManagementService);
    spyOn(userService,'addUser');
    formControls['firstName'].setValue("first");
    formControls['lastName'].setValue("last");
    formControls['email'].setValue("e@e.com");
    formControls['password'].setValue("aA1!1111");
    formControls['confirmPassword'].setValue("aA1!11112");

    fixture.detectChanges();
    formControls['confirmPassword'].markAsTouched();
console.log("after control touched, touch value is",formControls['confirmPassword'].markAsTouched());
    component.addUser();
    expect(component.signupForm.valid).toBeFalsy();
    expect(userService.addUser).not.toHaveBeenCalled();
  });

但测试用例失败并出现错误Expected true to be falsy.在浏览器窗口中我可以看到它正在显示touched属性true以及false！！（见图）

我可以看到该confirmPassword字段没有被触及。我究竟做错了什么？

Answer 1

在设置其值之前我必须将该字段标记为脏

formControls['confirmPassword'].markAsTouched({onlySelf:true});
    formControls['confirmPassword'].setValue("aA1!11112");

它似乎setValue运行了表单验证，并且由于当时该字段未标记为触摸，因此confirmPasswordValidator由 Angular 运行并返回，null使表单有效。调用markAsTouched不会重新运行表单验证，addUser然后发现表单有效。