如何为我的angular2表单编写使用香菜验证的jasmine单元测试？

在Angular中，我们可以使用Jasmine框架来编写单元测试。为了测试Angular 2表单中使用Cupertino（iOS风格）验证器的有效性，首先需要创建一个带有Cupertino验证器的表单，然后在Jasmine测试中编写相应的测试用例。

安装依赖项

确保已经安装了Angular CLI、Jasmine和Karma。如果尚未安装这些依赖项，请使用以下命令进行安装：

npm install -g @angular/cli jasmine-core karma karma-chrome-launcher --save-dev

创建Angular表单

在Angular项目中创建一个表单，该表单包含一个输入字段，使用Cupertino验证器进行验证。首先，导入所需的模块：

import { Component } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { CupertinoValidators } from '@angular/forms/src/validators/cupertino-validators';

@Component({
  selector: 'app-form',
  template: `
    <form [formGroup]="form">
      <input formControlName="name" type="text">
      <button [disabled]="!form.valid">Submit</button>
    </form>
  `
})
export class FormComponent {
  form: FormGroup;

  constructor(private fb: FormBuilder) {
    this.form = this.fb.group({
      name: ['', [Validators.required, CupertinoValidators.min(3)]]
    });
  }
}

编写Jasmine单元测试

接下来，编写Jasmine测试用例以验证表单的状态和验证器是否按预期工作。在spec文件夹中创建一个名为form.component.spec.ts的文件，并编写以下测试用例：

import { ComponentFixture, TestBed } from '@angular/core/testing';
import { ReactiveFormsModule } from '@angular/forms';
import { FormComponent } from './form.component';

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

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [FormComponent],
      imports: [ReactiveFormsModule]
    }).compileComponents();
  });

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

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

  it('form should be invalid initially', () => {
    expect(component.form.valid).toBeFalse();
  });

  it('form should be valid when name has minimum length', () => {
    component.form.controls.name.setValue('John');
    expect(component.form.valid).toBeTrue();
  });

  it('form should be invalid when name is too short', () => {
    component.form.controls.name.setValue('Jo');
    expect(component.form.valid).toBeFalse();
  });

  it('submit button should be disabled when form is invalid', () => {
    const submitButton = fixture.nativeElement.querySelector('button');
    expect(submitButton.disabled).toBeTrue();
  });

  it('submit button should be enabled when form is valid', () => {
    component.form.controls.name.setValue('John');
    fixture.detectChanges();
    const submitButton = fixture.nativeElement.querySelector('button');
    expect(submitButton.disabled).toBeFalse();
  });
});

完成以上步骤后，运行ng test命令以执行单元测试。所有测试用例应通过。

这就是如何为Angular 2表单编写使用Cupertino验证器的Jasmine单元测试。