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setupJest.js

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  • setupJest.js 1.97 KiB
    // Setup Jest to mock fetch
    
    import { JSDOM } from 'jsdom'; // eslint-disable-line import/no-extraneous-dependencies
    import fetch from 'jest-fetch-mock'; // eslint-disable-line import/no-extraneous-dependencies
    import Enzyme from 'enzyme'; // eslint-disable-line import/no-extraneous-dependencies
    import Adapter from '@wojtekmaj/enzyme-adapter-react-17'; // eslint-disable-line import/no-extraneous-dependencies
    
    const jsdom = new JSDOM('<!doctype html><html><body><div id="main"></div></body></html>', { url: 'https://localhost' });
    const { window } = jsdom;
    
    jest.setTimeout(10000);
    
    window.HTMLCanvasElement.prototype.getContext = () => {};
    jest.setMock('isomorphic-unfetch', fetch);
    require('jest-fetch-mock').enableMocks(); // eslint-disable-line import/no-extraneous-dependencies
    
    global.window = window;
    global.navigator = {
      userAgent: 'node.js',
    };
    
    /* eslint-disable  require-jsdoc, class-methods-use-this */
    class IntersectionObserverPolyfill {
      observe() {
      }
    
      disconnect() {
      }
    }
    /* eslint-enable  require-jsdoc, class-methods-use-this */
    
    global.IntersectionObserver = IntersectionObserverPolyfill;
    
    /** */
    function Path2D() {
    }
    
    global.Path2D = Path2D;
    /**
     * copy object property descriptors from `src` to `target`
     * @param {*} src
     * @param {*} target
     */
    const copyProps = (src, target) => {
      Object.defineProperties(target, {
        ...Object.getOwnPropertyDescriptors(src),
        ...Object.getOwnPropertyDescriptors(target),
      });
    };
    
    /*
      avoid 'ReferenceError: HTMLElement is not defined'
      see https://github.com/airbnb/enzyme/blob/master/docs/guides/jsdom.md
      for further information
    */
    copyProps(window, global);
    
    Enzyme.configure({ adapter: new Adapter() });
    
    jest.mock('react-i18next', () => ({
      // this mock makes sure any components using the translate HoC receive the t function as a prop
      withTranslation: () => (Component) => {
        Component.defaultProps = { // eslint-disable-line no-param-reassign
          ...Component.defaultProps, t: k => k,
        };
        return Component;
      },
    }));