无法在 Jest 中模拟 axios 调用

Question

It seems mocking is not working for me via axios as it seems to make acrtual API calls ( visible because I am getting 401 status code when running jest test ) I am not sure why am I not able to mock axios.Can anyone point out the我犯的错误？

索引.test.ts

describe("compositeScore()", () => {

    it("Mock Fetch API for Composite Score Response", async () => {
        
        const mock = jest.spyOn(axios, "post");
        mock.mockReturnValueOnce(mockResponse);
        const response = await dateFilter(platform);
        expect(mock).toHaveBeenCalledTimes(1);
        expect(response).toEqual(mockFetchCompositeScoreResponse);
    });
});

索引.ts

export const dateFilters = async (platform) => {
    const dates = await fetchWrapper(
        platform.toLowerCase().concat("DateFilters"),
        platform,
        {}
    );
    return dates;
};


export async function fetchWrapper(
    queryName: string,
    platform: string,
    queryParams?: {}
) {
   
    const headers = {
        Accept: "application/json",
        Authorization: `Bearer ${token}`,
        "Content-Type": "application/json",
     
    };
    const config: AxiosRequestConfig = {
        method: "post",
        url,
        headers,
        data: {
            db: dbName,
            csl: queryParams
                ? substituteQueryParameters(queries[queryName], queryParams)
                : queries[queryName],
        },
    };

    return axios(config);
}

Answer 1

尝试

import axios from 'axios';

jest.mock('axios');

在import被测系统之前，您需要先模拟模块。

https://jestjs.io/docs/mock-functions#mocking-modules

Answer 2

您使用的是axios function，而不是axios.post()方法。 所以你应该模拟axios function 而不是axios.post() 。 jest.mock()是选择。

例如

index.ts ：

import axios, { AxiosRequestConfig } from 'axios';

export const dateFilters = async (platform) => {
  const dates = await fetchWrapper(platform.toLowerCase().concat('DateFilters'), platform, {});
  return dates;
};

export async function fetchWrapper(queryName: string, platform: string, queryParams?: {}) {
  const token = '123';
  const url = 'http://localhost:3000/api';
  const dbName = 'test';

  const headers = {
    Accept: 'application/json',
    Authorization: `Bearer ${token}`,
    'Content-Type': 'application/json',
  };
  const config: AxiosRequestConfig = {
    method: 'post',
    url,
    headers,
    data: {
      db: dbName,
    },
  };

  return axios(config);
}

index.test.ts ：

import axios, { AxiosResponse } from 'axios';
import { dateFilters } from '.';

jest.mock('axios');

const mAxios = axios as jest.MockedFunction<typeof axios>;

describe('71351319', () => {
  it('Mock Fetch API for Composite Score Response', async () => {
    const mockResponse = { data: {}, status: 200, statusText: 'ok' } as AxiosResponse;
    mAxios.mockResolvedValue(mockResponse);
    const response = await dateFilters('DateFilters');
    expect(mAxios).toHaveBeenCalledTimes(1);
    expect(response).toEqual({ data: {}, status: 200, statusText: 'ok' });
  });
});

package 版本：

"axios": "^0.21.1",
"jest": "^26.6.3",