Issue #29392: Prevent crash when passing invalid arguments into msvcrt module.

1 files changed, 31 insertions, 0 deletions

diff --git a/Lib/test/test_unicode_identifiers.py b/Lib/test/test_unicode_identifiers.py
new file mode 100644
index 0000000000..0679845238
--- /dev/null
+++ b/Lib/test/test_unicode_identifiers.py
@@ -0,0 +1,31 @@
+import unittest
+import sys
+
+class PEP3131Test(unittest.TestCase):
+
+    def test_valid(self):
+        class T:
+            ä = 1
+            µ = 2 # this is a compatibility character
+            蟒 = 3
+            x󠄀 = 4
+        self.assertEqual(getattr(T, "\xe4"), 1)
+        self.assertEqual(getattr(T, "\u03bc"), 2)
+        self.assertEqual(getattr(T, '\u87d2'), 3)
+        self.assertEqual(getattr(T, 'x\U000E0100'), 4)
+
+    def test_non_bmp_normalized(self):
+        𝔘𝔫𝔦𝔠𝔬𝔡𝔢 = 1
+        self.assertIn("Unicode", dir())
+
+    def test_invalid(self):
+        try:
+            from test import badsyntax_3131
+        except SyntaxError as s:
+            self.assertEqual(str(s),
+              "invalid character in identifier (badsyntax_3131.py, line 2)")
+        else:
+            self.fail("expected exception didn't occur")
+
+if __name__ == "__main__":
+    unittest.main()