我有一个从视频元素中提取像宽度和高度这样的Meta数据的函数，如下所示：

export async function getVideoMetadata(
  videoBlobUrl: string,
  videoElement: HTMLVideoElement,
): Promise<{ width: number; height: number }> {
  // Trigger video load
  return new Promise<{ width: number; height: number }>((resolve, reject) => {
    videoElement.onloadedmetadata = () => {
      videoElement.width = videoElement.videoWidth;
      videoElement.height = videoElement.videoHeight;
      videoElement.currentTime = videoElement.duration * 0.25;
    };

    videoElement.onseeked = () => {
      resolve({ width: videoElement.videoWidth, height: videoElement.videoHeight });
    };

    videoElement.onerror = () => {
      reject(`Error loading video`);
    };
    videoElement.src = videoBlobUrl;
  });
}

字符串
在一个运行的环境中，代码运行完美，并提供了正确的高度和宽度的视频所需的结果。我在另一个函数中使用此函数在画布上绘制视频，以在客户端生成视频的缩略图。
但是，当我试图用jest编写一个测试时，与下面的函数相同：

it('should return video metadata', async () => {
    // Mock the videoBlobUrl
    const videoBlobUrl = 'https://example.com/mock-video-url.mp4';

    // Mock the HTMLVideoElement
    const videoElementMock: HTMLVideoElement = {
      onloadedmetadata: null,
      onseeked: null,
      onerror: null,
      width: 0,
      height: 0,
      videoWidth: 640, // Mock video width
      videoHeight: 480, // Mock video height
      duration: 10, // Mock video duration
      currentTime: 0,
      src: '',
      addEventListener: jest.fn(),
      removeEventListener: jest.fn(),
      dispatchEvent: jest.fn(),
      play: jest.fn(),
      pause: jest.fn(),
      load: jest.fn(),
    };

    // Spy on addEventListener to capture the event handlers
    const addEventListenerSpy = jest.spyOn(videoElementMock, 'addEventListener');

    // Call the function with the mocked data
    const result = await getVideoMetadata(videoBlobUrl, videoElementMock);

    // Assertions
    expect(videoElementMock.src).toBe(videoBlobUrl);
    expect(addEventListenerSpy).toHaveBeenCalledWith('loadedmetadata', expect.any(Function));
    expect(addEventListenerSpy).toHaveBeenCalledWith('seeked', expect.any(Function));

    // Trigger the loadedmetadata event
    const loadedMetadataHandler = (addEventListenerSpy as jest.Mock).mock.calls.find(
      (call) => call[0] === 'loadedmetadata',
    )[1] as EventListener;
    loadedMetadataHandler(new Event('loadedmetadata'));

    // Trigger the seeked event
    const seekedHandler = (addEventListenerSpy as jest.Mock).mock.calls.find(
      (call) => call[0] === 'seeked',
    )[1] as EventListener;
    seekedHandler(new Event('seeked'));

    // Validate the result
    expect(result).toEqual({width:640, height:480});
  });

型
测试用例总是失败，只要我在测试用例中调用getVideoMetadata函数，就抛出，而不继续下一行。

thrown: "Exceeded timeout of 5000 ms for a test.
    Use jest.setTimeout(newTimeout) to increase the timeout value, if this is a long-running test."

型
我试过增加测试的超时时间，但没有帮助。一旦测试代码videoElement.src = videoBlobUrl;到达，下一步就会失败，抛出错误。