diff -r 654d473f2951 Lib/test/test_ntpath.py
--- a/Lib/test/test_ntpath.py	Wed May 11 22:20:11 2011 -0700
+++ b/Lib/test/test_ntpath.py	Thu May 12 10:59:26 2011 -0700
@@ -240,6 +240,23 @@
         tester('ntpath.relpath("/a/b", "/a/b")', '.')
         tester('ntpath.relpath("c:/foo", "C:/FOO")', '.')
 
+    @staticmethod
+    def _create_file(filename):
+        with open(filename, 'wb') as f:
+            f.write(b'foo')
+        return f.name
+
+    def test_samefile(self):
+        test_fn = support.TESTFN + '1'
+        fname = self._create_file(test_fn)
+        self.assertTrue(ntpath.samefile(test_fn, test_fn))
+        self.assertTrue(ntpath.samefile(test_fn, fname))
+        self.assertTrue(ntpath.samefile(ntpath.abspath(test_fn), fname))
+        self.assertTrue(ntpath.samefile(test_fn.lower(), fname.upper()))
+        self.assertTrue(ntpath.samefile(test_fn.lower(),
+                                        ntpath.abspath(fname.upper())))
+        self.assertRaises(TypeError, ntpath.samefile)
+
     def test_sameopenfile(self):
         with TemporaryFile() as tf1, TemporaryFile() as tf2:
             # Make sure the same file is really the same