Enzyme docs包含如何测试具有ref
wrapper.ref('nameOfRef')
的节点,但这只适用于只有字符串值的refs,如果我在React中有一个节点:
<span ref="secondRef" amount={4}>Second</span>
然后它的测试将被写成:
expect(wrapper.ref('secondRef').prop('amount')).to.equal(4);
但如果我有一个带回调的参考,那么如何测试呢?酶文档[1]对此没有任何说明。例如,如果我有一个带有这样的ref的节点:
<SomeCustomReactElement ref={_form => form = _form} />
感谢您的指导。
[1]: http://airbnb.io/enzyme/docs/api/ReactWrapper/ref.html
答案 0 :(得分:2)
这里很好地介绍了测试参考:https://reactjs.org/blog/2016/11/16/react-v15.4.0.html#mocking-refs-for-snapshot-testing
(最好在apt-cache search ros-kinetic
之后的React.createRef
使用16.3
,如下所述:https://reactjs.org/docs/refs-and-the-dom.html,但相同的测试示例有效)
答案 1 :(得分:0)
您可以使用 ref
手动调用 wrapper.getElement()['ref'](mockRef)
回调。
例如
index.tsx
:
import React, { Component } from 'react';
export class SomeCustomReactElement extends Component {
doSomething() {
console.log('do somthing');
}
render() {
return <span>some custom react element</span>;
}
}
export default class MyComponent extends Component {
handleRef = (ref: SomeCustomReactElement) => {
console.log('handle ref');
ref.doSomething();
};
render() {
return (
<div>
<SomeCustomReactElement ref={this.handleRef} />
</div>
);
}
}
index.test.tsx
:
import React from 'react';
import { shallow } from 'enzyme';
import MyComponent, { SomeCustomReactElement } from './';
describe('48349435', () => {
it('should handle ref', () => {
const wrapper = shallow(<MyComponent />);
const mRef = {
doSomething: jest.fn(),
};
wrapper.find(SomeCustomReactElement).getElement()['ref'](mRef);
expect(mRef.doSomething).toBeCalledTimes(1);
});
});
单元测试结果:
PASS examples/48349435/index.test.tsx (7.984 s)
48349435
✓ should handle ref (44 ms)
console.log
handle ref
at Object.MyComponent.handleRef [as ref] (examples/48349435/index.tsx:14:13)
-----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
-----------|---------|----------|---------|---------|-------------------
All files | 77.78 | 100 | 60 | 77.78 |
index.tsx | 77.78 | 100 | 60 | 77.78 | 5-8
-----------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 10.273 s