如何在笑话和酶中为 useState Hook 设置初始状态? [英] How to set initial state for useState Hook in jest and enzyme?

问题描述

目前我正在使用带有反应钩子的功能组件.但我无法完全测试 useState 钩子.考虑这样的场景，在 useEffect 钩子中，我正在执行 API 调用并在 useState 中设置值.对于玩笑/酶，我模拟了要测试的数据，但我无法在玩笑中为 useState 设置初始状态值.

Currently Im using functional component with react hooks. But I'm unable to test the useState hook completely. Consider a scenario like, in useEffect hook I'm doing an API call and setting value in the useState. For jest/enzyme I have mocked data to test but I'm unable to set initial state value for useState in jest.

const [state, setState] = useState([]);

我想在玩笑中将初始状态设置为对象数组.我找不到任何类似于类组件的 setState 函数.

I want to set initial state as array of object in jest. I could not find any setState function as similar like class component.

推荐答案

您可以模拟 React.useState 以在测试中返回不同的初始状态:

You can mock React.useState to return a different initial state in your tests:

// Cache original functionality
const realUseState = React.useState

// Stub the initial state
const stubInitialState = ['stub data']

// Mock useState before rendering your component
jest
  .spyOn(React, 'useState')
  .mockImplementationOnce(() => realUseState(stubInitialState))

参考: https://dev.to/theactualgivens/testing-react-hook-state-changes-2oga

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