text: import autofit as af
  import autoastro as aast
  
  import pytest
  
  
  @pytest.fixture(autouse=True)
  def reset_config():
      """
      Use configuration from the default path. You may want to change this to set a specific path.
      """
      af.conf.instance = af.conf.default
  
  
  class TestCase:
      def test_integration(self):
          # Create a mapper. This can be used to convert values output by a non linear optimiser into class instances.
          mapper = af.ModelMapper()
  
          # Create a model_galaxy prior for the source model_galaxy. Here we are describing only the light profile of
          # the source model_galaxy which comprises an elliptical exponential and elliptical sersic light profile.
          source_galaxy_prior = aast.GalaxyModel(
              redshift=aast.Redshift,
              light_profile_one=aast.lp.EllipticalExponential,
              light_profile_2=aast.lp.EllipticalSersic,
          )
  
          # Create a model_galaxy prior for the source model_galaxy. Here we are describing both the light and mass
          # profiles. We've also stipulated that the centres of any galaxies generated using the model_galaxy prior
          # should match.
          lens_galaxy_prior = aast.GalaxyModel(
              redshift=aast.Redshift,
              light_profile=aast.lp.EllipticalExponential,
              mass_profile=aast.mp.EllipticalExponential,
              align_centres=True,
          )
  
          mapper.source_galaxy = source_galaxy_prior
          mapper.lens_galaxy = lens_galaxy_prior
  
          # Create a model instance. All the instances of the profile classes are created here. Normally we would do this
          # using the output of a non linear search but in this case we are using the median values from the priors.
          instance = mapper.instance_from_prior_medians()
  
          # Recover model_galaxy instances. We can pass the model instance to model_galaxy priors to recover a fully
          # constructed model_galaxy
          source_galaxy = instance.source_galaxy
          lens_galaxy = instance.lens_galaxy
  
          # Let's just check that worked
          assert len(source_galaxy.light_profiles) == 2
          assert len(source_galaxy.mass_profiles) == 0
  
          assert len(lens_galaxy.light_profiles) == 1
          assert len(lens_galaxy.mass_profiles) == 1
  
          assert source_galaxy.redshift == 1.5
          assert lens_galaxy.redshift == 1.5
  