diff -r 5d43154d68a8 Lib/test/support.py
--- a/Lib/test/support.py	Sun Jul 08 21:03:01 2012 +0200
+++ b/Lib/test/support.py	Mon Jul 09 06:14:08 2012 -0700
@@ -615,7 +615,7 @@
     except OSError:
         if not quiet:
             raise
-        warnings.warn('tests may fail, unable to change the CWD to ' + name,
+        warnings.warn('tests may fail, unable to change the CWD to ' + path,
                       RuntimeWarning, stacklevel=3)
     try:
         yield os.getcwd()
diff -r 5d43154d68a8 Lib/test/test_support.py
--- a/Lib/test/test_support.py	Sun Jul 08 21:03:01 2012 +0200
+++ b/Lib/test/test_support.py	Mon Jul 09 06:14:08 2012 -0700
@@ -95,6 +95,15 @@
         self.assertFalse(os.path.exists(TESTFN))
         self.assertTrue(os.path.basename(os.getcwd()), here)
 
+    def test_temp_cwd__chdir_warning(self):
+        """Check the warning message when os.chdir() fails."""
+        path = TESTFN + '_does_not_exist'
+        with support.check_warnings() as recorder:
+            with support.temp_cwd(path=path, quiet=True):
+                pass
+            messages = [str(w.message) for w in recorder.warnings]
+        self.assertEqual(messages, ['tests may fail, unable to change the CWD to ' + path])
+
     def test_sortdict(self):
         self.assertEqual(support.sortdict({3:3, 2:2, 1:1}), "{1: 1, 2: 2, 3: 3}")
 
diff -r 5d43154d68a8 Misc/ACKS
--- a/Misc/ACKS	Sun Jul 08 21:03:01 2012 +0200
+++ b/Misc/ACKS	Mon Jul 09 06:14:08 2012 -0700
@@ -505,6 +505,7 @@
 Drew Jenkins
 Flemming Kjær Jensen
 MunSic Jeong
+Chris Jerdonek
 Jim Jewett
 Orjan Johansen
 Fredrik Johansson
diff -r 5d43154d68a8 Misc/NEWS
--- a/Misc/NEWS	Sun Jul 08 21:03:01 2012 +0200
+++ b/Misc/NEWS	Mon Jul 09 06:14:08 2012 -0700
@@ -104,6 +104,9 @@
 - Issue #15284: Skip {send,recv}msg tests in test_socket when IPv6 is not
   enabled. Patch by Brian Brazil.
 
+- Issue #15304: Fix warning message when os.chdir() fails inside
+  test.support.temp_cwd(). Patch by Chris Jerdonek.
+
 - Issue #15277: Fix a resource leak in support.py when IPv6 is disabled.
   Patch by Brian Brazil.