How to unitest npm `request.post` using jest

Question

I am using npm request , How to mock request.post I need to test the error scenario, statuscode not 200 scenario and the success flow.

1 request.post(reqObject, (error: Error, response: any, body: any) => {
2     if (error) { return reject(error); }
3     if (response.statusCode !== 200) {
4         return reject('Invalid status code <' + response.statusCode + '>');
5     }
6     return resolve(JSON.parse(body));
7 });

Answer 1

The request object can be mocked by jest.mock('request') .

Something like this:

const request = require("request");
jest.mock('request', () => {
    return {
        post: () => { 
            console.log("mocked"); 
            // or something like jest.fn()
        }
    };
});

test('test description', () => {
    // request.post within fetchData has been mocked
    // await fetchData(); 
});