How to use the @better-scroll/core/src/base/EventRegister function in @better-scroll/core

registorEvent() {
    this.eventRegistor = new EventRegister(this.scroll.scroller.wrapper, [
      {
        name: 'wheel',
        handler: this.wheelHandler.bind(this)
      },
      {
        name: 'mousewheel',
        handler: this.wheelHandler.bind(this)
      },
      {
        name: 'DOMMouseScroll', // FireFox
        handler: this.wheelHandler.bind(this)
      }
    ])
  }
  wheelHandler(e: CompatibleWheelEvent) {

beforeEach(() => {
    fakeNode = document.createElement('div')
    mockHandler = jest.fn(() => 'it is a test handler ')
    eventRegister = new EventRegister(fakeNode, [
      {
        name: 'test',
        handler: mockHandler as any
      }
    ])
  })
  afterEach(() => {