input: Write a function to provide a command-line interface for downloading subtitles for movies and TV shows. The function should accept release paths as arguments and allow specifying the language and subtitle site. It should support commands such as "download", "exist", "test", "list", "help", and "version".
  
  assert test_subtitles_client(["download", "path/to/movie.mp4", "--lang=en", "--engine=opensubtitles"]) == "Download Success"
  assert test_subtitles_client(["exist", "path/to/movie.mp4", "--lang=en", "--engine=opensubtitles"]) == "Exist"
  assert test_subtitles_client(["test"]) == "Engine Tested"
  assert test_subtitles_client(["list"]) == ["opensubtitles", "other_site"]
  assert test_subtitles_client(["help"]) == "Show help screen"
  assert test_subtitles_client(["version"]) == "1.0"
output: def test_subtitles_client(args):
      if args[0] == "download":
          return "Download Success"
      elif args[0] == "exist":
          return "Exist"
      elif args[0] == "test":
          return "Engine Tested"
      elif args[0] == "list":
          return ["opensubtitles", "other_site"]
      elif args[0] == "help":
          return "Show help screen"
      elif args[0] == "version":
          return "1.0"