[英]How to spy only one react hook useState
我想将测试隔离到目标 useState。
假设我有 3 个 useState,其中一些在我的组件中,一些在这个测试用例的子组件中。
目前,这记录了 3 个不同的使用状态。 如何定位我想要的那个。 可以说它叫做 setMovies。
const createMockUseState = <T extends {}>() => {
type TSetState = Dispatch<SetStateAction<T>>;
const setState: TSetState = jest.fn((prop) => {
// if setMovies ???
console.log('jest - spy mock = ', prop);
});
type TmockUseState = (prop: T) => [T, TSetState];
const mockUseState: TmockUseState = (prop) => [prop, setState];
const spyUseState = jest.spyOn(React, 'useState') as jest.SpyInstance<[T, TSetState]>;
spyUseState.mockImplementation(mockUseState);
};
interface Props {
propertyToTest: boolean
};
describe('Search Movies', () => {
describe('Onload - do first search()', () => {
beforeAll(async () => {
createMockUseState<PROPS>();
wrapper = mount(
<ProviderMovies>
<SearchMovies />
</ProviderMovies>
);
await new Promise((resolve) => setImmediate(resolve));
await act(
() =>
new Promise<void>((resolve) => {
resolve();
})
);
});
});
});
我们知道反应钩子取决于每个初始化 position。 例如,如果你的组件中有 3 个钩子并且你想模拟 2-nd,你应该用必要的数据模拟 1 和 2。 像这样的东西
//mock for test file
jest.mock(useState); // you should mock here useState from React
//mocks for each it block
const useMockHook = jest.fn(...);
jest.spyOn(React, 'useState').mockReturnValueOnce(useMockHook);
expect(useMockHook).toHaveBeenCalled();
// after that you can check whatever you need
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