commit 28a6cfaefc41a4e4bfa6dd0b54318c0465987652
author Benjamin Peterson <benjamin@python.org> Tue Aug 28 17:55:35 2012 -0400
committer Benjamin Peterson <benjamin@python.org> Tue Aug 28 17:55:35 2012 -0400
tree b3334773d534a57edf85e637c30e2c07ce53f3b6
parent 2412c93a6068221686397c26b129215eac024e9c

use the stricter PyMapping_Check (closes #15801)

Lib/test/string_tests.py

diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index d792529..413f9dd 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -1142,6 +1142,9 @@
         self.checkraises(TypeError, '%10.*f', '__mod__', ('foo', 42.))
         self.checkraises(ValueError, '%10', '__mod__', (42,))
 
+        class X(object): pass
+        self.checkraises(TypeError, 'abc', '__mod__', X())
+
     def test_floatformatting(self):
         # float formatting
         for prec in range(100):