spec/frontend/mocks_spec.js


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import $ from 'jquery';
import axios from '~/lib/utils/axios_utils';

describe('Mock auto-injection', () => {
  describe('mocks', () => {
    let failMock;
    beforeEach(() => {
      failMock = jest.spyOn(global, 'fail').mockImplementation();
    });

    it('~/lib/utils/axios_utils', done => {
      expect(axios.get('http://gitlab.com')).rejects.toThrow('Unexpected unmocked request');
      setImmediate(() => {
        expect(failMock).toHaveBeenCalledTimes(1);
        done();
      });
    });

    it('jQuery.ajax()', () => {
      expect($.ajax).toThrow('Unexpected unmocked');
      expect(failMock).toHaveBeenCalledTimes(1);
    });
  });
});