old_contents: import pytest
  
  
  @pytest.mark.django_db
  class TestGalery:
      def test_str(self, gallery):
          gallery_str = str(gallery)
          assert gallery.label in gallery_str
          assert gallery.description in gallery_str
  
  
  class TestMedium:
      def test_str(self, medium):
          medium_str = str(medium)
          assert medium.label in medium_str
          assert medium.description in medium_str
  
new_contents: import pytest
  
  
  @pytest.mark.django_db
  class TestGalery:
      def test_str(self, gallery):
          gallery_str = str(gallery)
          assert gallery.label in gallery_str
          assert gallery.description in gallery_str
  
  
  @pytest.mark.django_db
  class TestMedium:
      def test_str(self, medium):
          medium_str = str(medium)
          assert medium.label in medium_str
          assert medium.description in medium_str
  
subject: fix forgotten mark