old_contents: from django import VERSION
  
  from .testapp.models import AdjacencyListModel, NestedSetModel
  
  
  VERSION_PRE_19 = VERSION < (1, 9)
  
  
  def actual_test(model_id, user_create, request_client):
  
      user = user_create(superuser=True)
  
      client = request_client()
      assert client.login(username=user.username, password='password')
  
      url_base = '/admin/testapp/%s/' % model_id
  
      resp = client.get(url_base)
  
      assert 'Upper level' not in resp.rendered_content
  
      if VERSION_PRE_19:
          assert '/1/' in resp.rendered_content
      else:
          assert '/1/change/' in resp.rendered_content
  
      assert 'href="?pid=1"' in resp.rendered_content
      assert model_id + '_parent' in resp.rendered_content
      assert model_id + '_child1' not in resp.rendered_content
      assert model_id + '_child2' not in resp.rendered_content
  
      resp = client.get(url_base + '?pid=1')
  
      assert 'Upper level' in resp.rendered_content
  
      if VERSION_PRE_19:
          assert '/1/' not in resp.rendered_content
          assert '/2/?_changelist_filters=pid%3D1' in resp.rendered_content
          assert '/3/?_changelist_filters=pid%3D1' in resp.rendered_content
  
  
      else:
          assert '/1/change/' not in resp.rendered_content
          assert '/2/change/?_changelist_filters=pid%3D1' in resp.rendered_content
          assert '/3/change/?_changelist_filters=pid%3D1' in resp.rendered_content
  
      assert model_id + '_parent' not in resp.rendered_content
      assert model_id + '_child1' in resp.rendered_content
      assert model_id + '_child2' in resp.rendered_content
  
      # Foreign key popup.
      resp = client.get(url_base + '?_to_field=id&_popup=1')
  
      assert '?pid=1&amp;_to_field=id&amp;_popup=1' in resp.rendered_content
      assert model_id + '_parent' in resp.rendered_content
  
  
  def test_adjacency_list(request_client, user_create):
  
      def make_node(title, parent=None):
          node = AdjacencyListModel(title=title, parent=parent)
          node.save()
          return node
  
      parent = make_node('parent')
      make_node('child1', parent=parent)
      make_node('child2', parent=parent)
  
      actual_test('adjacencylistmodel', user_create, request_client)
  
  
  
  def test_nested_set(request_client, user_create):
  
      def make_node(title, left, right, level):
          node = NestedSetModel(title=title, lft=left, rgt=right, level=level)
          node.save()
          return node
  
      make_node('parent', left=1, right=6, level=0)
      make_node('child1', left=2, right=3, level=1)
      make_node('child2', left=4, right=5, level=1)
  
      actual_test('nestedsetmodel', user_create, request_client)
  
new_contents: from django import VERSION
  
  from .testapp.models import AdjacencyListModel, NestedSetModel
  
  
  VERSION_PRE_19 = VERSION < (1, 9)
  
  
  def actual_test(model_id, user_create, request_client):
  
      user = user_create(superuser=True)
  
      client = request_client()
      assert client.login(username=user.username, password='password')
  
      url_base = '/admin/testapp/%s/' % model_id
  
      resp = client.get(url_base)
  
      assert 'Upper level' not in resp.rendered_content
  
      if VERSION_PRE_19:
          assert '/1/' in resp.rendered_content
      else:
          assert '/1/change/' in resp.rendered_content
  
      assert 'href="?pid=1"' in resp.rendered_content
      assert model_id + '_parent' in resp.rendered_content
      assert model_id + '_child1' not in resp.rendered_content
      assert model_id + '_child2' not in resp.rendered_content
  
      resp = client.get(url_base + '?pid=1')
  
      assert 'Upper level' in resp.rendered_content
  
      if VERSION_PRE_19:
          assert '/1/' not in resp.rendered_content
          assert '/2/?_changelist_filters=pid%3D1' in resp.rendered_content
          assert '/3/?_changelist_filters=pid%3D1' in resp.rendered_content
  
  
      else:
          assert '/1/change/' not in resp.rendered_content
          assert '/2/change/?_changelist_filters=pid%3D1' in resp.rendered_content
          assert '/3/change/?_changelist_filters=pid%3D1' in resp.rendered_content
  
      assert model_id + '_parent' not in resp.rendered_content
      assert model_id + '_child1' in resp.rendered_content
      assert model_id + '_child2' in resp.rendered_content
  
      # Foreign key popup.
      resp = client.get(url_base + '?_to_field=id&_popup=1')
  
      print(resp.rendered_content)
  
      assert '?pid=1&amp;' in resp.rendered_content
      assert '_popup=1' in resp.rendered_content
      assert model_id + '_parent' in resp.rendered_content
  
  
  def test_adjacency_list(request_client, user_create):
  
      def make_node(title, parent=None):
          node = AdjacencyListModel(title=title, parent=parent)
          node.save()
          return node
  
      parent = make_node('parent')
      make_node('child1', parent=parent)
      make_node('child2', parent=parent)
  
      actual_test('adjacencylistmodel', user_create, request_client)
  
  
  
  def test_nested_set(request_client, user_create):
  
      def make_node(title, left, right, level):
          node = NestedSetModel(title=title, lft=left, rgt=right, level=level)
          node.save()
          return node
  
      make_node('parent', left=1, right=6, level=0)
      make_node('child1', left=2, right=3, level=1)
      make_node('child2', left=4, right=5, level=1)
  
      actual_test('nestedsetmodel', user_create, request_client)
  
subject: Test fix.