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', () => {
      return Promise.all([
        expect(axios.get('http://gitlab.com')).rejects.toThrow('Unexpected unmocked request'),
        setImmediate(() => {
          expect(failMock).toHaveBeenCalledTimes(1);
        }),
      ]);
    });

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