Issue #19013: add unittest.main() epilogs to unittest's own test modules
diff --git a/Lib/unittest/test/test_assertions.py b/Lib/unittest/test/test_assertions.py
index 7931cad..af08d5a 100644
--- a/Lib/unittest/test/test_assertions.py
+++ b/Lib/unittest/test/test_assertions.py
@@ -361,3 +361,7 @@
                               ['^"regex" does not match "foo"$', '^oops$',
                                '^"regex" does not match "foo"$',
                                '^"regex" does not match "foo" : oops$'])
+
+
+if __name__ == "__main__":
+    unittest.main()