Angular2 如何对自定义验证器指令进行单元测试? [英] Angular2 how to unit test a custom validator directive?
问题描述
我为输入字段编写了一个非常简单的自定义验证器:
I wrote a very simple custom validor for an input field:
import { Directive } from '@angular/core';
import { AbstractControl, NG_VALIDATORS } from '@angular/forms';
function numberValidator(c: AbstractControl) {
if (!c.value) return null;
return new RegExp('^[1-9][0-9]{6,9}$').test(c.value) ? null : {
validateNumber: {
valid: false
}
}
}
@Directive({
selector: '[number-validator]',
providers: [
{ provide: NG_VALIDATORS, multi: true, useValue: numberValidator }
]
})
export class NumberValidator {
}
我想对这个验证器进行单元测试.我在 Angular2 上阅读了 Test an attribute directive页面,但没有更改的 css 或 html.如何对这个验证器进行单元测试?
I would like to unittest this validator. I read Test an attribute directive on the Angular2 page, but there is no css or html that changes. How can I unittest this validator?
推荐答案
如果你想用简单的方法(我会这样做,因为所有的逻辑都在验证器函数中),只是测试验证器函数.只需将控件传递给它
If you want to do it the easy way (which I would do, since all the logic is in the validator function), is just to test the validator function. Just pass a control to it
expect(numberValidator(new FormControl('123456'))).toEqual({
'validateNumber': { 'valid': false }
});
expect(numberValidator(new FormControl('123456789'))).toEqual(null);
如果你真的想在被使用"的时候测试它,那么它会变得有点乏味.这些通常是我采取的步骤
If you really want to test it when "being used", then it gets a little tedious. These are usually the steps I take
- 创建虚拟组件以使用指令
- 设置测试台配置
- 创建要测试的组件.
- 获取本机输入元素并向其分派无效输入事件
- 获取持有
NgForm
的注入器 - 检查表单是否失败
- 输入有效的输入并检查它是否通过.
与仅测试验证器方法相比,这要多得多.但无论如何都在这里 ;-) 享受吧!
It's a lot compared to just testing the validator method. But here it is anyway ;-) Enjoy!
import { Component, Directive } from '@angular/core';
import { TestBed, async } from '@angular/core/testing';
import { dispatchEvent } from '@angular/platform-browser/testing/browser_util';
import { By } from '@angular/platform-browser';
import { FormsModule, NG_VALIDATORS, AbstractControl,
NgForm, FormControl } from '@angular/forms';
function numberValidator(c: AbstractControl) {
if (!c.value) return null;
return new RegExp('^[1-9][0-9]{6,9}$').test(c.value) ? null : {
validateNumber: {
valid: false
}
};
}
@Directive({
selector: '[number-validator]',
providers: [
{ provide: NG_VALIDATORS, multi: true, useValue: numberValidator }
]
})
export class NumberValidator {
}
@Component({
template: `
<form>
<input name="number" type="text" ngModel number-validator />
</form>
`
})
class TestComponent {
}
describe('component: TestComponent', () => {
beforeEach(() => {
TestBed.configureTestingModule({
imports: [ FormsModule ],
declarations: [TestComponent, NumberValidator]
});
});
it('should validate (easy)', () => {
expect(numberValidator(new FormControl('123'))).toEqual({
'validateNumber': { 'valid': false }
});
expect(numberValidator(new FormControl('123456789'))).toEqual(null);
});
it('should validate (tedious)', async(() => {
let fixture = TestBed.createComponent(TestComponent);
let comp = fixture.componentInstance;
let debug = fixture.debugElement;
let input = debug.query(By.css('[name=number]'));
fixture.detectChanges();
fixture.whenStable().then(() => {
input.nativeElement.value = '123';
dispatchEvent(input.nativeElement, 'input');
fixture.detectChanges();
let form: NgForm = debug.children[0].injector.get(NgForm);
let control = form.control.get('number');
// just to show a few different ways we can check validity
expect(control.hasError('validateNumber')).toBe(true);
expect(control.valid).toBe(false);
expect(form.control.valid).toEqual(false);
expect(form.control.hasError('validateNumber', ['number'])).toEqual(true);
input.nativeElement.value = '123456789';
dispatchEvent(input.nativeElement, 'input');
fixture.detectChanges();
expect(form.control.valid).toEqual(true);
});
}));
});
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