new_contents: import pytest
  
  from knowit.provider import Provider
  from knowit.units import units
  
  
  @pytest.mark.parametrize(
      'frame_rate', [
          pytest.param(3.4 * units.fps, id='Frame rate with magnitude'),
          pytest.param(1, id='Frame rate without magnitude'),
      ],
  )
  def test_provider_validate_track_frame_rate(frame_rate):
      track = {'frame_rate': 0}
      Provider._validate_track('video', track)
  
subject: Add tests for provider