ant-design/components/_util/__tests__/responsiveObserve.test.js

import ResponsiveObserve, { responsiveMap } from '../responsiveObserve';

describe('Test ResponsiveObserve', () => {
  it('test ResponsiveObserve subscribe and unsubscribe', () => {
    const { xs } = responsiveMap;
    const subscribeFunc = jest.fn();
    const token = ResponsiveObserve.subscribe(subscribeFunc);
    expect(ResponsiveObserve.matchHandlers[xs].mql.matches).toBeTruthy();
    expect(subscribeFunc).toBeCalledTimes(1);

    ResponsiveObserve.unsubscribe(token);
    expect(ResponsiveObserve.matchHandlers[xs].mql.removeListener).toBeCalled();
  });
});