[英]jest function must be a mock or spy
我正在编写一个测试,我在我的应用程序中测试操作。 我在尝试获得最后一个被调用的期望时遇到了麻烦。
const pushData = jest.fn(() => Promise.resolve());
test('anotherAsyncCall is fired to get more info', () => {
const store = mockStore({});
asynCallToGetData = jest.fn(() => Promise.resolve());
const action = pushData();
const dispatch = jest.fn();
const anotherAsyncCall = jest.fn(() => Promise.resolve());
const expectedActions = [{
type: 'DATA_RECEIVED_SUCCESS'
}];
return store.dispatch(action).then(() => {
expect(asynCallToGetData).toHaveBeenCalled();
expect(store.getActions()).toMatch(expectedActions[0].type);
expect(dispatch(anotherAsyncCall)).toHaveBeenCalled(); //This fails
});
});
但是我在运行测试后得到的消息是
expect(jest.fn())[.not].toHaveBeenCalled()
jest.fn() value must be a mock function or spy.
Received: undefined here
您应该使用jest.spyOn(object, methodName)来创建 Jest 模拟函数。 例如:
const video = require('./video');
test('plays video', () => {
const spy = jest.spyOn(video, 'play');
const isPlaying = video.play();
expect(spy).toHaveBeenCalled();
expect(isPlaying).toBe(true);
spy.mockReset();
spy.mockRestore();
});
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