ant-design/components/_util/__tests__/util.test.tsx

import React from 'react';
import KeyCode from 'rc-util/lib/KeyCode';

import { fireEvent, render, waitFakeTimer } from '../../../tests/utils';
import { isStyleSupport } from '../styleChecker';
import throttleByAnimationFrame from '../throttleByAnimationFrame';
import TransButton from '../transButton';

describe('Test utils function', () => {
  describe('throttle', () => {
    beforeAll(() => {
      jest.useFakeTimers();
    });

    afterAll(() => {
      jest.useRealTimers();
    });

    afterEach(() => {
      jest.clearAllTimers();
    });

    it('throttle function should work', async () => {
      const callback = jest.fn();
      const throttled = throttleByAnimationFrame(callback);
      expect(callback).not.toHaveBeenCalled();

      throttled();
      throttled();
      await waitFakeTimer();

      expect(callback).toHaveBeenCalled();
      expect(callback.mock.calls.length).toBe(1);
    });

    it('throttle function should be canceled', async () => {
      const callback = jest.fn();
      const throttled = throttleByAnimationFrame(callback);

      throttled();
      throttled.cancel();
      await waitFakeTimer();

      expect(callback).not.toHaveBeenCalled();
    });
  });

  describe('TransButton', () => {
    it('can be focus/blur', () => {
      const ref = React.createRef<HTMLDivElement>();
      render(<TransButton ref={ref}>TransButton</TransButton>);
      expect(typeof ref.current?.focus).toBe('function');
      expect(typeof ref.current?.blur).toBe('function');
    });

    it('should trigger onClick when press enter', () => {
      const onClick = jest.fn();

      const { container } = render(<TransButton onClick={onClick}>TransButton</TransButton>);

      // callback should trigger
      fireEvent.keyUp(container.querySelector('div')!, { keyCode: KeyCode.ENTER });
      expect(onClick).toHaveBeenCalledTimes(1);

      // callback should not trigger
      fireEvent.keyDown(container.querySelector('div')!, { keyCode: KeyCode.ENTER });
      expect(onClick).toHaveBeenCalledTimes(1);
    });
  });

  describe('style', () => {
    it('isStyleSupport', () => {
      expect(isStyleSupport('color')).toBe(true);
      expect(isStyleSupport('not-existed')).toBe(false);
    });

    it('isStyleSupport return false in service side', () => {
      const spy = jest
        .spyOn(window.document, 'documentElement', 'get')
        .mockImplementation(() => undefined as unknown as HTMLElement);
      expect(isStyleSupport('color')).toBe(false);
      expect(isStyleSupport('not-existed')).toBe(false);
      spy.mockRestore();
    });
  });
});