PY-18839: Adding test

python/testData/testRunner/env/unit/rerun_derived.py

@@ -0,0 +1,13 @@
+import unittest
+
+from unittest import TestCase
+
+class BaseTestCases:
+    class TestAbstract(TestCase):
+        def test_a(self):
+            raise Exception()
+
+
+class TestDerived(BaseTestCases.TestAbstract):
+    def test_b(self):
+        print("Running from derived class")