1 files changed, 32 insertions, 23 deletions
diff --git a/test/orm/test_events.py b/test/orm/test_events.py
index 1390da497..bb1a935de 100644
--- a/test/orm/test_events.py
+++ b/test/orm/test_events.py
@@ -1,33 +1,37 @@
-from sqlalchemy.testing import assert_raises_message, assert_raises
 import sqlalchemy as sa
+from sqlalchemy import event
+from sqlalchemy import Integer
+from sqlalchemy import String
 from sqlalchemy import testing
-from sqlalchemy import Integer, String
 from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.testing.schema import Table, Column
-from sqlalchemy.orm import (
-    mapper,
-    relationship,
-    create_session,
-    class_mapper,
-    Mapper,
-    column_property,
-    query,
-    Session,
-    sessionmaker,
-    attributes,
-    configure_mappers,
-)
-from sqlalchemy.orm.instrumentation import ClassManager
-from sqlalchemy.orm import instrumentation, events
+from sqlalchemy.orm import attributes
+from sqlalchemy.orm import class_mapper
+from sqlalchemy.orm import column_property
+from sqlalchemy.orm import configure_mappers
+from sqlalchemy.orm import create_session
+from sqlalchemy.orm import events
 from sqlalchemy.orm import EXT_SKIP
+from sqlalchemy.orm import instrumentation
+from sqlalchemy.orm import Mapper
+from sqlalchemy.orm import mapper
+from sqlalchemy.orm import query
+from sqlalchemy.orm import relationship
+from sqlalchemy.orm import Session
+from sqlalchemy.orm import sessionmaker
 from sqlalchemy.orm.mapper import _mapper_registry
-from sqlalchemy.testing import eq_, is_not_, assert_raises
-from sqlalchemy.testing import fixtures
+from sqlalchemy.testing import assert_raises
+from sqlalchemy.testing import assert_raises_message
 from sqlalchemy.testing import AssertsCompiledSQL
+from sqlalchemy.testing import eq_
+from sqlalchemy.testing import fixtures
+from sqlalchemy.testing import is_not_
+from sqlalchemy.testing.mock import ANY
+from sqlalchemy.testing.mock import call
+from sqlalchemy.testing.mock import Mock
+from sqlalchemy.testing.schema import Column
+from sqlalchemy.testing.schema import Table
 from sqlalchemy.testing.util import gc_collect
 from test.orm import _fixtures
-from sqlalchemy import event
-from sqlalchemy.testing.mock import Mock, call, ANY
 
 
 class _RemoveListeners(object):
@@ -167,7 +171,12 @@ class MapperEventsTest(_RemoveListeners, _fixtures.FixtureTest):
         m = mapper(
             User,
             users,
-            properties={"addresses": relationship(lambda: ImNotAClass)},
+            properties={
+                # intentionally non-existent class to ensure
+                # the lambda is not called, simulates a class from
+                # a not-yet-imported module
+                "addresses": relationship(lambda: ImNotAClass)  # noqa
+            },
         )
         event.listen(User, "before_insert", lambda *a, **kw: None)
         assert not m.configured