stubbing.js

const sinon = require('sinon');
const chai = require('chai');
const expect = chai.expect;

const SomeController = require('../../app/controllers/SomeController')

describe('SomeController', () => {
  let stub;
  beforeEach(() => {
    stub = sinon.stub(SomeController, 'doAPICall');
  });

  describe('addLeave', () => {
    it('Should be a function', () => {
      expect(SomeController.addLeave).to.be.a('function');
    });
    it('Should return false if no employeeID', async () => {
      const result = await BambooController.addLeave();
      expect(result).to.be.false;
    });
    it('Should return an array of objects', async () => {
      stub.resolves('10');
      const result = await SomeController.addLeave('5');
      expect(result).to.equal('success');
    });
    it('Should return false after being rejected', async () => {
      stub.rejects();
      const result = await SomeController.addLeave('5');
      expect(result).to.throw();
    });
  });

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