用玩笑嘲笑高阶组件 [英] Mocking a higher order component with jest

问题描述

我想确保使用笑话来调用HOC组件，但是我似乎无法使jest.mock正常工作.我的HOC是这样的:

I want to ensure that a HOC component is being called with jest, but I can't seem to get jest.mock to work. My HOC is like this:

const withEntity = (
  ...args
) => {
  const wrappedComponent = WrappedComponent => {
    const innerComponent = ({ ...props }) => {    
      return (
        <WrapperComponent
          {...props}
        >
          <WrappedComponent />
        </WrapperComponent>
      );
    };

    innerComponent.propTypes = {
      ...
    };

    return innerComponent;
  };

  wrappedComponent.propTypes = {
    ...
  };

  return wrappedComponent;
};

withEntity.propTypes = {
  ...
};

export default withEntity;

在一个单独的文件中，withEntity函数的调用方式如下:

In a separate file, the withEntity function is called like this:

export const DoSomething = withEntity(...args)(MyComponent);

然后，在DoSomething组件的测试文件中，我试图导入withEntity函数并对其进行模拟，如下所示:

Then, in the testing file for the DoSomething component, i'm trying to import the withEntity function and mock it like so:

import withEntity from "../../../shared/entity/higher_order_components/withEntity";
jest.mock("../../../shared/entity/higher_order_components/withEntity");

但是当我实际尝试运行测试时，出现此错误:

But when I actually attempt to run the test, I get this error:

  ● Test suite failed to run

    TypeError: (0 , _withEntity.default)(...) is not a function

不确定导致该错误的原因是什么，我在这里做错了什么?

Not sure what to make of that error, what am I doing wrong here?

推荐答案

模拟您的HOC应该如下所示:

Mocking your HOC should look like this:

jest.mock('../your/HOC', () => () => 
    Component => props => <Component {...props} /> 
)

它可以读为:

jest.mock('../your/HOC', () => `

创建一个返回您的HOC函数的模拟程序，

create a mock that returns your HOC function,

() => 

返回您的HOC aka withEntity(...args)，

the function that returns your HOC aka withEntity(...args),

Component => props => <Component {...props} /> 

HOC本身是一个函数，该函数获取组件并返回一个函数，该函数获取道具，并返回一个函数，该函数返回具有其道具的渲染组件.

the HOC itself, which is a function that gets the component and return a function that get the props and return a function that returns the rendered component with its props.

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