Add a regression test for issue #4633

Author: Pierre-Sassoulas

tests/functional/r/regression/regression_issue_4633.py

@@ -0,0 +1,22 @@
+# pylint: disable=missing-docstring,too-few-public-methods,no-self-use
+
+"""
+Regression tests for https://github.com/PyCQA/pylint/issues/4633
+"""
+
+from queue import Queue
+from unittest.mock import MagicMock
+
+mock = MagicMock(name="mock")
+
+
+class Ham(mock.spam):
+    def __init__(self):
+        self.queue = Queue()
+
+
+class SecondHam:
+    def whatever(self):
+        test_var = Ham()
+        while not test_var.queue.empty():
+            pass