reactjs - 开 Jest jest.fn 它正在被调用，但期望失败

Question

我是开 Jest 测试的新手，我写了下面的测试。 我 Jest mock 了一个函数并将其作为参数传递。 但是当运行测试时，在日志中我可以看到函数 onSuccess 被调用。 但 expect 失败并出现代码下方的错误。

我应该如何断言调用了 onSuccess = jest.fn()？

测试

 it('should create product correctly', async () => {
            const store = mockStore()
            const onSuccess = jest.fn(() => console.log("I was called"))
            const onError = jest.fn()
            const CreateProductApiMock = CreateProductApi as jest.Mock
            const productRequest = {id: 1} as Product

            CreateProductApiMock.mockResolvedValue(Promise.resolve({
                data: "any"
            } as AxiosResponse<string>))


            await store.dispatch(createProduct(productRequest, onSuccess, onError, "jwt"))
            expect(CreateProductApiMock).toHaveBeenCalledWith({"id": 1}, "jwt")
            expect(onSuccess).toHaveBeenCalledTimes(1)
        })

日志:

console.log src/__tests__/components/product/product-slice.test.ts:133
    I've was called


Error: expect(jest.fn()).toHaveBeenCalledTimes(expected)

Expected number of calls: 1
Received number of calls: 0

Answer 1

模拟 dispatch 怎么样？然后调用您的操作并检查是否被调用，例如:

const dispatch = jest.fn();
await createProduct(productRequest, onSuccess, onError, "jwt")(dispatch);
expect(dispatch).toHaveBeenCalledTimes(1);
expect(dispatch).toHaveBeenCalledWith({"id": 1}, "jwt");