使用 Jest 如何测试在单元测试下的函数中的承诺被解决时执行的步骤?
例子:
// FUNCTION TO TEST
export function functionToTest(url) {
initSomething().then(() => {
console.log('YEP, CALLED');
storeHistory.push(url);
});
}
// UNIT TEST
import { functionToTest, __RewireAPI__ as rewireUtility } from './funcToTest';
describe('functionToTest', () => {
let pushSpy;
beforeEach(() => {
pushSpy = jest.fn();
rewireUtility.__set__('storeHistory', { push: pushSpy });
rewireUtility.__set__('initSomething', () => Promise.resolve());
});
it('pushes the given url to history after initializing cordova', () => {
functionToTest('/sports');
expect(pushSpy).toHaveBeenCalledTimes(1);
expect(pushSpy).toHaveBeenCalledWith('/sports');
});
});
在这种情况下 pushSpy 被调用 0 次(即使日志被打印出来)。我怎样才能正确地测试这个?
用这个解决了:
it.only('pushes the given url to history after initializing cordova', (done) => {
rewireUtility.__Rewire__('history', { push: (route) => {
expect(route).toEqual('/sports');
done();
} });
functionToTest('test://sports');
});
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