old_contents: import pytest
  
  import sncosmo
  
  
  @pytest.mark.might_download
  def test_hst_bands():
      """  check that the HST and JWST bands are accessible """
      for bandname in ['f606w', 'uvf606w', 'f125w', 'f127m',
                       'f115w']:  # jwst nircam
          sncosmo.get_bandpass(bandname)
  
  
  @pytest.mark.might_download
  def test_jwst_miri_bands():
      for bandname in ['f1130w']:
          sncosmo.get_bandpass(bandname)
  
  
  @pytest.mark.might_download
  def test_ztf_bandpass():
      bp = sncosmo.get_bandpass('ztfg')
  
  
  @pytest.mark.might_download
  def test_roman_bandpass():
      sncosmo.get_bandpass('f062')
      sncosmo.get_bandpass('f087')
      sncosmo.get_bandpass('f106')
      sncosmo.get_bandpass('f129')
      sncosmo.get_bandpass('f158')
      sncosmo.get_bandpass('f184')
      sncosmo.get_bandpass('f213')
      sncosmo.get_bandpass('f146')
  
new_contents: import pytest
  
  import sncosmo
  
  from sncosmo.bandpasses import _BANDPASSES, _BANDPASS_INTERPOLATORS
  from sncosmo.magsystems import _MAGSYSTEMS
  from sncosmo.models import _SOURCES
  
  
  bandpasses = [i['name'] for i in _BANDPASSES.get_loaders_metadata()]
  bandpass_interpolators = [i['name'] for i in
                            _BANDPASS_INTERPOLATORS.get_loaders_metadata()]
  magsystems = [i['name'] for i in _MAGSYSTEMS.get_loaders_metadata()]
  sources = [(i['name'], i['version']) for i in _SOURCES.get_loaders_metadata()]
  
  
  @pytest.mark.might_download
  @pytest.mark.parametrize("name", bandpasses)
  def test_builtin_bandpass(name):
      sncosmo.get_bandpass(name)
  
  
  @pytest.mark.might_download
  @pytest.mark.parametrize("name", bandpass_interpolators)
  def test_builtin_bandpass_interpolator(name):
      interpolator = _BANDPASS_INTERPOLATORS.retrieve(name)
      interpolator.at(interpolator.minpos())
  
  
  @pytest.mark.might_download
  @pytest.mark.parametrize("name,version", sources)
  def test_builtin_source(name, version):
      sncosmo.get_source(name, version)
  
  
  @pytest.mark.might_download
  @pytest.mark.parametrize("name", magsystems)
  def test_builtin_magsystem(name):
      sncosmo.get_magsystem(name)
  
subject: Add tests for all builtins