code: def assert_files_same(path1, path2):
      # type: (str, str) -> None
      
      difflines = compare_files(path1, path2)
      assert len(difflines) == 0, ''.join(['\n'] + difflines)
docs: Asserts that two files are the same and returns delta using
      -, ?, + format if not
  
      Args:
          path1 (str): Path to first file
          path2 (str): Path to second file
  
      Returns:
          None