Instantiate the OS-related exception as soon as we raise it, so that
"except" works properly.
diff --git a/Lib/test/test_pep3151.py b/Lib/test/test_pep3151.py
index 9d92425..3c52bc6 100644
--- a/Lib/test/test_pep3151.py
+++ b/Lib/test/test_pep3151.py
@@ -79,6 +79,18 @@
e = SubOSError(EEXIST, "Bad file descriptor")
self.assertIs(type(e), SubOSError)
+ def test_try_except(self):
+ # This checks that try .. except checks the concrete exception
+ # (FileNotFoundError) and not the base type specified when
+ # PyErr_SetFromErrnoWithFilenameObject was called.
+ # (it is therefore deliberate that it doesn't use assertRaises)
+ try:
+ open("some_hopefully_non_existing_file")
+ except FileNotFoundError:
+ pass
+ else:
+ self.fail("should have raised a FileNotFoundError")
+
class AttributesTest(unittest.TestCase):