self.assertEqual(testing.get_dir_size(self.path_a), 4)
    self.assertEqual(testing.get_dir_size(self.path_b), 8)

  def test_get_size_ratio(self):
    self.assertEqual(testing.get_size_ratio(self.path_a, self.path_b), 0.5)
    self.assertEqual(testing.get_size_ratio(self.path_b, self.path_a), 2.0)


if __name__ == '__main__':

  """
  total = 0
  for root, _, files in os.walk(path):
    for filename in files:
      total += os.path.getsize(os.path.join(root, filename))
  return total


def get_size_ratio(path_a: str, path_b: str) -> float:
  """Return the size ratio of the given paths.

  Args:
    path_a: Path of a directory or a file to be the nominator of the ratio.