How to mock axios dependency using mocha in TypeScript?

user_11224019 0
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Here is my sample src/main.ts file

import axios from 'axios';
export async function main() {
     const URL = 'test url';
     const secretKey = 'Test key'
     const response = await axios.get(URL, {
        headers: { 'Content-Type': 'application/json', 'KEY': secretKey },
    });

I want to write my test case in spec/test.ts file using mocha. Can someone show me how to create a mock and stub for axios dependency.

typescript mocha.js node.js unit-testing javascript
1 Answers

For mock/stub axios in typestript I recommend axios-mock-adapter, for expect functions chai

Here is an example of how to do this

request.ts

import axios from 'axios';

const apiConfig = {
    returnRejectedPromiseOnError: true,
    timeout: 30000,
    headers: {
        common: {
            'Content-Type': 'application/json',
            'Accept': 'application/json',
        },
    },
};

const request = axios.create(apiConfig);
export default request;

main.ts

import request from './request';

export const URL = 'https://httpbin.org/get';
export const secretKey = 'secret_key';

export async function main() {

    const response = await request.get(URL, {
        headers: {
            KEY: secretKey,
        },
    });

    // response logic

    return response;
}

main.spec.ts

import MockAdapter from 'axios-mock-adapter';
import { expect } from 'chai';

import request from './request';
import { main, URL, secretKey } from './main';


describe('Request test', () => {
    let stub: MockAdapter;
    const receivedData = { data: 'data' };

    before(() => {
        stub = new MockAdapter(request);
        stub.onGet(URL, {
            headers: {
                KEY: secretKey,
            },
        }).replyOnce(200, receivedData);
        // replyOnce if you assume that your code sends a single request
    });

    it('test', async () => {
        const response = await main();

        expect(response.status).to.be.equal(200);
        expect(response.data).to.be.deep.equal(receivedData);
    });

    after(() => {
        stub.restore();
    });
});
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