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The watch in the component is as follows:

player(isPlay) {
  if (isPlay) {
    this.playState = 'play'
  } else {
    this.playState = 'pause'
  }
}

The relevant use cases in the test file Home.spec.js are as follows

it('播放狀態(tài)切換', () => {
  const Constructor = Vue.extend(Home)
  const vm = new Constructor().$mount()
  vm.playerShow = true
  Vue.nextTick( () => {
    expect(vm.playState).to.equal("play")
  })
  vm.playerShow = false
  Vue.nextTick( () => {
    expect(vm.playState).to.equal("pause")
    done()
  })
})

After writing this, check the coverage report and find that the watch part of the code in the component is not covered (all are red)
Please tell me how to write a use case to cover the watch code