Sinon stub axios throws error : TypeError: Attempted to wrap get which is already wrapped - axios

Question

There are few existing questions on stack overflow with this error but none of them explains this error on stubbing axios. I took the boilerplate working example from sinonjs.org and tried to mock axios. It throws the error
TypeError: Attempted to wrap get which is already wrapped
Code below:
import Axios from 'axios';
var sandbox = require('sinon').createSandbox();
describe('axios.get method', function () {
beforeEach(function () {
// stub out the `axios` method
sandbox.stub(Axios, 'get');
});
afterEach(function () {
// completely restore all fakes created through the sandbox
sandbox.restore();
});
it('should be called once', function () {});
});

Answer 1

The reason why you got this error is that you stub the Axios.get method more than once. The code you provided works fine. So you need to call sanbox.restore() method to restore all fakes created through the sandbox before stubbing the method again. Please check your code DOES NOT stub the Axios.get method continuous.
E.g.
index.test.ts:
import Axios from 'axios';
import sinon from 'sinon';
const sandbox = sinon.createSandbox();
describe('axios.get method', () => {
let axiosGetStub;
beforeEach(() => {
axiosGetStub = sandbox.stub(Axios, 'get');
});
afterEach(() => {
sandbox.restore();
});
it('should be called once', () => {
Axios.get('http://localhost:3000');
sandbox.assert.calledOnce(axiosGetStub);
});
it('should be called once again', () => {
Axios.get('http://localhost:3000');
sandbox.assert.calledOnce(axiosGetStub);
});
});
unit test result:
axios.get method
✓ should be called once
✓ should be called once again
2 passing (29ms)