React Navigation：如何测试使用 withNavigation HOC 的组件？

Question

我正在使用 Jest 为我的 React Native 应用编写单元测试。我有一个组件，包裹在 withNavigation HOC.

我的问题是我的测试崩溃了，抛出：

● LoginScreen component › given no props: should render a login form

    Invariant Violation: withNavigation can only be used on a view hierarchy of a navigator. The wrapped component is unable to get access to navigation from props or context.

我正在使用 @testing-library/react-native for my tests and I 这样的：

import { render } from '@testing-library/react-native';
import React from 'react';
import { NavigationContext } from 'react-navigation';
import { Provider } from 'react-redux';

import store from '../src/store';

const WithProviders = ({ children }) => {
  return (
    <Provider store={store}>
      <NavigationContext.Provider>{children}</NavigationContext.Provider>
    </Provider>
  );
};

const customRender = (ui, options) =>
  render(ui, {
    wrapper: WithProviders,
    ...options,
  });

export * from '@testing-library/react-native';

export { customRender as render };

这适用于 Redux 上下文，但不适用于导航提供程序。

如何测试包装在 withNavigation HOC 中的组件？

更新：

我尝试了这样的建议答案：

jest.mock('react-navigation', () => ({
  withNavigation: Component => props => <Component {...props} />,
}));

afterAll(() => {
  jest.restoreAllMocks();
});

但这不起作用。我收到错误：

Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Answer 1

你应该模拟 react-navigation，像这样：

jest.mock("react-navigation", ({ withNavigation: (component) => component })

然后将道具传递给您的组件：

const mockProps = {
    navigation: { navigate: jest.fn() }
}

wrapper = shallow(<LoginScreen {...mockProps}/>)

Answer 2

根据忽必烈的回答，我是这样解决的：

jest.mock('react-navigation', () => ({
  withNavigation: Component => props => (
    <Component navigation={{ navigate: jest.fn() }} {...props} />
  ),
  SafeAreaView: ({ children }) => <>{children}</>,
}));

afterAll(() => {
  jest.restoreAllMocks();
});

我不得不嘲笑 withNavigation 以及 SafeAreaView。

这还是很不满意的一种方式。如果有人知道如何在自定义渲染方法中注入正确的 React Navigation 提供程序，我将非常感激。

理想情况下，应该有一种方法可以配置将内容包装在容器中的自定义渲染器。这是我用 Redux 做的。

import { render } from '@testing-library/react-native';
import React from 'react';
import { Provider } from 'react-redux';

import configureStore from '../src/redux/store.js';

const store = configureStore();

const WithProviders = ({ children }) => (
  <Provider store={store}>{children}</Provider>
);

const customRender = (ui, options) =>
  render(ui, { wrapper: WithProviders, ...options });

export * from '@testing-library/react-native';

export { customRender as render };

React Navigation：如何测试使用 withNavigation HOC 的组件？

React Navigation: How to test components that use the withNavigation HOC?

react-native

jestjs

react-navigation

higher-order-components

react-testing-library