new_contents: from nose.tools import assert_false
  from mock import Mock, PropertyMock, patch
  from .models import Photo
  
  
  def test_dont_access_source():
      """
      Touching the source may trigger an unneeded query.
      See <https://github.com/matthewwithanm/django-imagekit/issues/295>
  
      """
      pmock = PropertyMock()
      pmock.__get__ = Mock()
      with patch.object(Photo, 'original_image', pmock):
          photo = Photo()  # noqa
          assert_false(pmock.__get__.called)
  
subject: Add test to illustrate GH-295