[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/orm/test_groups.py

@@ -153,7 +153,6 @@ def test_add_nodes(self):
         group.add_nodes([])
         assert set(_.pk for _ in nodes) == set(_.pk for _ in group.nodes)
 
-
     def test_remove_nodes(self):
         """Test node removal."""
         node_01 = orm.Data().store()
@@ -186,7 +185,6 @@ def test_remove_nodes(self):
         group.remove_nodes([])
         assert set(_.pk for _ in nodes) == set(_.pk for _ in group.nodes)
 
-
     def test_clear(self):
         """Test the `clear` method to remove all nodes."""
         node_01 = orm.Data().store()