bpo-31492: Fix assertion failures in case of a module with a bad __name__ attribute. (#3620)

1 files changed, 12 insertions, 0 deletions

diff --git a/Lib/test/test_import/__init__.py b/Lib/test/test_import/__init__.py
index ddef27d..5a610ba 100644
--- a/Lib/test/test_import/__init__.py
+++ b/Lib/test/test_import/__init__.py
@@ -400,6 +400,18 @@ class ImportTests(unittest.TestCase):
         self.assertEqual(str(cm.exception),
             "cannot import name 'does_not_exist' from '<unknown module name>' (unknown location)")
 
+    @cpython_only
+    def test_issue31492(self):
+        # There shouldn't be an assertion failure in case of failing to import
+        # from a module with a bad __name__ attribute, or in case of failing
+        # to access an attribute of such a module.
+        with swap_attr(os, '__name__', None):
+            with self.assertRaises(ImportError):
+                from os import does_not_exist
+
+            with self.assertRaises(AttributeError):
+                os.does_not_exist
+
     def test_concurrency(self):
         sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'data'))
         try: