diff --git a/gitlab/tests/mixins/test_mixin_methods.py b/gitlab/tests/mixins/test_mixin_methods.py
index 557c02045..fbc16a9bb 100644
--- a/gitlab/tests/mixins/test_mixin_methods.py
+++ b/gitlab/tests/mixins/test_mixin_methods.py
@@ -44,7 +44,7 @@ def resp_cont(url, request):
 
 
 def test_refresh_mixin(gl):
-    class O(RefreshMixin, FakeObject):
+    class TestClass(RefreshMixin, FakeObject):
         pass
 
     @urlmatch(scheme="http", netloc="localhost", path="/api/v4/tests/42", method="get")
@@ -55,7 +55,7 @@ def resp_cont(url, request):
 
     with HTTMock(resp_cont):
         mgr = FakeManager(gl)
-        obj = O(mgr, {"id": 42})
+        obj = TestClass(mgr, {"id": 42})
         res = obj.refresh()
         assert res is None
         assert obj.foo == "bar"
@@ -265,7 +265,7 @@ def test_save_mixin(gl):
     class M(UpdateMixin, FakeManager):
         pass
 
-    class O(SaveMixin, base.RESTObject):
+    class TestClass(SaveMixin, base.RESTObject):
         pass
 
     @urlmatch(scheme="http", netloc="localhost", path="/api/v4/tests/42", method="put")
@@ -276,7 +276,7 @@ def resp_cont(url, request):
 
     with HTTMock(resp_cont):
         mgr = M(gl)
-        obj = O(mgr, {"id": 42, "foo": "bar"})
+        obj = TestClass(mgr, {"id": 42, "foo": "bar"})
         obj.foo = "baz"
         obj.save()
         assert obj._attrs["foo"] == "baz"
diff --git a/gitlab/tests/mixins/test_object_mixins_attributes.py b/gitlab/tests/mixins/test_object_mixins_attributes.py
index 3502a93f9..d54fa3abf 100644
--- a/gitlab/tests/mixins/test_object_mixins_attributes.py
+++ b/gitlab/tests/mixins/test_object_mixins_attributes.py
@@ -27,35 +27,35 @@
 
 
 def test_access_request_mixin():
-    class O(AccessRequestMixin):
+    class TestClass(AccessRequestMixin):
         pass
 
-    obj = O()
+    obj = TestClass()
     assert hasattr(obj, "approve")
 
 
 def test_subscribable_mixin():
-    class O(SubscribableMixin):
+    class TestClass(SubscribableMixin):
         pass
 
-    obj = O()
+    obj = TestClass()
     assert hasattr(obj, "subscribe")
     assert hasattr(obj, "unsubscribe")
 
 
 def test_todo_mixin():
-    class O(TodoMixin):
+    class TestClass(TodoMixin):
         pass
 
-    obj = O()
+    obj = TestClass()
     assert hasattr(obj, "todo")
 
 
 def test_time_tracking_mixin():
-    class O(TimeTrackingMixin):
+    class TestClass(TimeTrackingMixin):
         pass
 
-    obj = O()
+    obj = TestClass()
     assert hasattr(obj, "time_stats")
     assert hasattr(obj, "time_estimate")
     assert hasattr(obj, "reset_time_estimate")
@@ -64,16 +64,16 @@ class O(TimeTrackingMixin):
 
 
 def test_set_mixin():
-    class O(SetMixin):
+    class TestClass(SetMixin):
         pass
 
-    obj = O()
+    obj = TestClass()
     assert hasattr(obj, "set")
 
 
 def test_user_agent_detail_mixin():
-    class O(UserAgentDetailMixin):
+    class TestClass(UserAgentDetailMixin):
         pass
 
-    obj = O()
+    obj = TestClass()
     assert hasattr(obj, "user_agent_detail")
diff --git a/gitlab/tests/test_gitlab.py b/gitlab/tests/test_gitlab.py
index 4a8220725..127b2c1d0 100644
--- a/gitlab/tests/test_gitlab.py
+++ b/gitlab/tests/test_gitlab.py
@@ -86,10 +86,10 @@ def test_gitlab_build_list(gl):
     assert obj.total == 2
 
     with HTTMock(resp_page_2):
-        l = list(obj)
-    assert len(l) == 2
-    assert l[0]["a"] == "b"
-    assert l[1]["c"] == "d"
+        test_list = list(obj)
+    assert len(test_list) == 2
+    assert test_list[0]["a"] == "b"
+    assert test_list[1]["c"] == "d"
 
 
 @with_httmock(resp_page_1, resp_page_2)