gitlab-org--gitlab-foss/spec/frontend/blob/sketch/index_spec.js

import SketchLoader from '~/blob/sketch';
import waitForPromises from 'helpers/wait_for_promises';

jest.mock('jszip', () => {
  return {
    loadAsync: jest.fn().mockResolvedValue({
      files: {
        'previews/preview.png': {
          async: jest.fn().mockResolvedValue('foo'),
        },
      },
    }),
  };
});

describe('Sketch viewer', () => {
  beforeEach(() => {
    loadFixtures('static/sketch_viewer.html');
  });

  describe('with error message', () => {
    beforeEach(() => {
      jest.spyOn(SketchLoader.prototype, 'getZipFile').mockImplementation(
        () =>
          new Promise((resolve, reject) => {
            reject();
          }),
      );

      return new SketchLoader(document.getElementById('js-sketch-viewer'));
    });

    it('renders error message', () => {
      expect(document.querySelector('#js-sketch-viewer p')).not.toBeNull();

      expect(document.querySelector('#js-sketch-viewer p').textContent.trim()).toContain(
        'Cannot show preview.',
      );
    });

    it('removes the loading icon', () => {
      expect(document.querySelector('.js-loading-icon')).toBeNull();
    });
  });

  describe('success', () => {
    beforeEach(() => {
      jest.spyOn(SketchLoader.prototype, 'getZipFile').mockResolvedValue();
      // eslint-disable-next-line no-new
      new SketchLoader(document.getElementById('js-sketch-viewer'));

      return waitForPromises();
    });

    it('does not render error message', () => {
      expect(document.querySelector('#js-sketch-viewer p')).toBeNull();
    });

    it('removes the loading icon', () => {
      expect(document.querySelector('.js-loading-icon')).toBeNull();
    });

    it('renders preview img', () => {
      const img = document.querySelector('#js-sketch-viewer img');

      expect(img).not.toBeNull();
      expect(img.classList.contains('img-fluid')).toBeTruthy();
    });

    it('renders link to image', () => {
      const img = document.querySelector('#js-sketch-viewer img');
      const link = document.querySelector('#js-sketch-viewer a');

      expect(link.href).toBe(img.src);
      expect(link.target).toBe('_blank');
    });
  });
});