diff -r 4afe9faeb1f9 Lib/test/test_filecmp.py
--- a/Lib/test/test_filecmp.py	Sat Jul 26 19:40:31 2014 -0400
+++ b/Lib/test/test_filecmp.py	Sat Jul 26 23:50:21 2014 -0400
@@ -3,6 +3,7 @@
 import shutil
 import tempfile
 import unittest
+import time
 
 from test import support
 
@@ -19,12 +20,23 @@
 
         with open(self.name_diff, 'a+') as output:
             output.write('An extra line.\n')
+
+        # Create file of the same length with 'data' in all uppercase
+        # so size is the same but content is different
+        self.name_uppercase = support.TESTFN + '-uppercase'
+        # sleep one second to ensure that they have different creation times
+        time.sleep(1)
+        # write uppercase file
+        with open(self.name_uppercase, 'w+') as output:
+            output.write(data.upper())
+
         self.dir = tempfile.gettempdir()
 
     def tearDown(self):
         os.unlink(self.name)
         os.unlink(self.name_same)
         os.unlink(self.name_diff)
+        os.unlink(self.name_uppercase)
 
     def test_matching(self):
         self.assertTrue(filecmp.cmp(self.name, self.name_same),
@@ -42,6 +54,21 @@
         self.assertFalse(filecmp.cmp(self.name, self.dir),
                     "File and directory compare as equal")
 
+        self.assertFalse(filecmp.cmp(self.name, self.name_uppercase),
+                    "Shallow comparison to 'uppercase' is equal")
+
+        self.assertFalse(filecmp.cmp(self.name, self.name_uppercase, shallow=False),
+                    "Non-shallow comparison to 'uppercase' is equal")
+
+        # Set the access time of self.name and self.name_uppercase to be the same
+        atime = time.time()
+        os.utime(self.name, (atime,atime))
+        os.utime(self.name_uppercase, (atime,atime))
+        self.assertTrue(filecmp.cmp(self.name, self.name_uppercase),
+                    "Shallow comparison to 'uppercase' with same atime/mtime is unequal")
+        self.assertFalse(filecmp.cmp(self.name, self.name_uppercase, shallow=False),
+                    "Non-shallow comparison to 'uppercase' with same atime/mtime is equal")
+
     def test_cache_clear(self):
         first_compare = filecmp.cmp(self.name, self.name_same, shallow=False)
         second_compare = filecmp.cmp(self.name, self.name_diff, shallow=False)