Javascript 如何模拟函数,并测试它们';在react组件中作为道具传递时重新调用?
我遵循这个答案的例子-。我有一个示例组件和测试设置。加载到App.js中时,该组件可以正常工作 成分-Javascript 如何模拟函数,并测试它们';在react组件中作为道具传递时重新调用?,javascript,unit-testing,reactjs,jestjs,Javascript,Unit Testing,Reactjs,Jestjs,我遵循这个答案的例子-。我有一个示例组件和测试设置。加载到App.js中时,该组件可以正常工作 成分- import React, { PropTypes, Component } from 'react'; export default class ExampleModule extends Component { static propTypes = { onAction: PropTypes.func, } static defaultProps = { onA
import React, { PropTypes, Component } from 'react';
export default class ExampleModule extends Component {
static propTypes = {
onAction: PropTypes.func,
}
static defaultProps = {
onAction: () => { console.log("In onAction"); }
}
doAction = () => {
// do something else
console.log('In do action');
this.props.onAction();
}
render() {
return(
<div>
<button className='action-btn' onClick= {this.doAction.bind(this)}>Do action</button>
</div>
)
}
}
我尝试了jest.fn()
,但也遇到了同样的错误
如何模拟这些函数并测试它们
编辑:
我可以通过以下方式使用jest.fn()模拟doAction
:
let mockFn = jest.fn();
Example.doAction = mockFn()
然而,我仍然无法模拟
Example.props.onAction
在您的测试中,当您呈现文档时,您需要传递一个模拟函数,您可以稍后查看它是否被调用,类似这样-
let onActionMock = jest.fn();
beforeAll(function() {
Example = TestUtils.renderIntoDocument(<ExampleComponent onAction={onActionMock}/>);
});
beforeEach(function() {
onActionMock.mockClear();
});
it('doAction calls onAction', () => {
Example.doAction();
expect(onActionMock).toBeCalled();
});
希望这有帮助。只是一个信息:
TestUtils已被移动到react dom/test utils
:
TypeError: Cannot assign to read only property 'onAction' of #<Object>
let mockFn = jest.fn();
Example.doAction = mockFn()
let onActionMock = jest.fn();
beforeAll(function() {
Example = TestUtils.renderIntoDocument(<ExampleComponent onAction={onActionMock}/>);
});
beforeEach(function() {
onActionMock.mockClear();
});
it('doAction calls onAction', () => {
Example.doAction();
expect(onActionMock).toBeCalled();
});
expect(onActionMock).toBeCalledWith('Some argument');