我正在用 Jest 为我的 React Native 应用程序编写单元测试。我有一个组件,它包含在 withNavigation
HOC. 中
我的问题是我的测试崩溃,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
我和我的测试set up a custom render method像这样: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
中的组件? HOC?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。我得到错误:
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.
最佳答案
根据 Kubilay 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 mock
withNavigation
以及 SafeAreaView
.这仍然是一个非常不满意的方式。如果有人知道如何在自定义渲染方法中注入(inject)正确的 React Navigation 提供程序,我将非常感激。
理想情况下,应该有一种方法来配置将内容包装在容器中的自定义渲染器。这是我使用 Redux 的方法。
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 };
关于react-native - react 导航 : How to test components that use the withNavigation HOC?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57525516/