笑话测试通过，但代码覆盖率未涵盖所有行

Question

以下我在React中编写的代码已在测试用例中进行了介绍，但是当我进行代码覆盖时，这两个设置状态没有被覆盖。我尝试了不同的方法，从酶库中更新状态变化，并且还在模拟响应中的硬编码值，以使其满足当前输出。

let arr = this.state.chats;
console.log(arr);
arr.splice(-1, 1);
this.setState(
  {
    chats: arr,
  },
  () => {
    this.setState({
      // hide: false,
      chats: this.state.chats.concat([
        {
          timestamp: time.toLocaleString(
            'en-US',
            { hour: 'numeric', minute: 'numeric', hour12: true },
          ),
          username: 'Alice Chen', //bot usernmae
          content: content,
          buttons: content1 || [],
          img: botavatar,
        },
      ]),
    });
  },
);

我的测试用例：

//expect change state on message array
it('should change state of chats array with response messages', () => {
  const wrapper = mount(<Chatroom />);
  const chats = [];
  const newchatsArrayAfterResponse = [
    {
      timestamp: '1530103502304',
      username: 'Alice Chen', //bot usernmae
      content: 'Hi',
      buttons: ['hi'],
      img: 'Dummy Image',
    },
  ];
  expect(wrapper.find('.chats div li').length).toEqual(0);
  wrapper.setState({ chats: newchatsArrayAfterResponse });
  expect(wrapper.find('.chats div li').length).toEqual(1);
});

//expect change state of loader after response has come
it('expect change state of loader after response has come', () => {
  const wrapper = mount(<Chatroom />);
  const chats = [];
  const arr = [
    {
      content: 'change service level',
      timestamp: '6:38 PM', //bot usernmae
      username: 'Kevin Hsu',
    },
  ];
  console.log(wrapper.find('.loader-image').length);
  expect(wrapper.find('.loader-image').length).toEqual(1);
  wrapper.setState({ chats: arr });
  console.log(wrapper.find('.loader-image').length);

  expect(wrapper.find('.loader-image').length).toEqual(0);
});