input: from typing import List
  
  
  def extract_top_trending_videos(soup: BeautifulSoup) -> List[str]:
      """ Extract the top ten trending YouTube videos from a given BeautifulSoup object.
      >>> from bs4 import BeautifulSoup
      >>> soup = BeautifulSoup('<html><body><div class="yt-lockup-content"><a class="yt-uix-tile-link" href="/watch?v=video1">Video 1</a></div><div class="yt-lockup-content"><a class="yt-uix-tile-link" href="/watch?v=video2">Video 2</a></div></body></html>', 'html.parser')
      >>> extract_top_trending_videos(soup)
      ['Video 1', 'Video 2']
      """
output:     video_links = soup.find_all('a', class_='yt-uix-tile-link')
      top_videos = [link.text for link in video_links[:10]]
      return top_videos