Redux-Form:如何在Jest中模拟formValueSelector

问题描述：

我有一个组件Demo，其Label取决于redux-form状态下字段的当前值.我正在使用formValueSelector从表单状态获取"param"字段的当前值.它工作正常.但是，在运行npm test时，选择器函数始终返回undefined.我该如何嘲笑它?

I have a component Demo whose Label depends on the current value of a field in the redux-form state. I am using formValueSelector to get the current value of "param" field from the form state. It works fine. However, while running npm test, the selector function always returns undefined. How can I mock it?

如果我做错了方法，请告诉我.

Please let me know if I am doing this in a wrong way.

我有一个类似

class Sample extends React.Component {
render() {
    const {param, state} = this.props;
    const selector = formValueSelector('sampleform');
    return (
        <div>
            <Demo
                name="name"
                label={selector(state, `${param}`)}
            />
        </div>
    );
}

} 导出默认样本；

并且，测试代码就像

function setup() {
    const spy = jest.fn();
    const store = createStore(() => ({}));
    const Decorated = reduxForm({ form: 'sampleform' })(Sample);

    const props = {
        "param":"keyOfState",
        "state":{"keyOfState":"Label"}
    }
    const mockedComponent = <Provider store={store}>
        <MuiThemeProvider muiTheme={MuiStyles()}>
            <Decorated {...props}>
                <span></span>
            </Decorated>
        </MuiThemeProvider>
    </Provider>;
    return {
        props,
        mockedComponent}
}
describe('Sample Component', () => {
    it('should render the snapshot', () => {
        const { mockedComponent } = setup()
        const tree = renderer.create(
            mockedComponent
        ).toJSON();
        expect(tree).toMatchSnapshot();
    });
});

答

您没有为formValueSelector提供针对选择器期望状态的适当模拟.

You aren't providing the formValueSelector with an adequate mock for the state that the selector expects.

解决方案:选择器期望redux提供的全局状态对象.当前的嘲笑状态并不反映这一点.将模拟物更改为期望的形状可解决此问题:

Solution: The selector expects the global state object provided by redux. The current mocked state doesn't reflect this. Changing the mock to the shape expected fixes the issue:

它是这样的形状:

{
  form: {
    sampleform: {
      values: {
        keyOfState: "Label"
      }
    }
  }
}

注意:存储在sampleform键上的对象包含更多条目，但与模拟无关.

Note: the object stored at the sampleform key includes more entries, but they are irrelevant for the mock.

这里是解决您问题的复制品的链接: https://github.com/mjsisley/reduxFormMockIssue

Here is a link to a reproduction that resolves your issue:https://github.com/mjsisley/reduxFormMockIssue

请注意:我是由马特·洛(Matt Lowe)指挥的.我是与他一起从事其他多个项目的开发人员.

Please note: I was directed here by Matt Lowe. I am the developer that has worked with him on a number of other projects.

Redux-Form:如何在Jest中模拟formValueSelector

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