make unit tests pass on the mac

tests/gclient_scm_test.py

Index: tests/gclient_scm_test.py
diff --git a/tests/gclient_scm_test.py b/tests/gclient_scm_test.py
index 5f3418f089a495e53ffeda54e48003ad39ca72e7..1c1b2045790e566cebe47fe82809b13d40402189 100755
--- a/tests/gclient_scm_test.py
+++ b/tests/gclient_scm_test.py
@@ -692,7 +692,7 @@ from :3
     if not self.enabled:
       return
     options = self.Options(verbose=True)
-    root_dir = tempfile.mkdtemp()
+    root_dir = gclient_scm.os.path.realpath(tempfile.mkdtemp())
     relpath = 'foo'
     base_path = join(root_dir, relpath)
     url = join(self.base_path, '.git')
@@ -725,6 +725,7 @@ from :3
           join(gclient_scm.os.path.realpath(root_dir), 'foo'))
     out = sys.stdout.getvalue()
     sys.stdout.close()
+    sys.stdout = self._old_stdout
     self.assertTrue(out in (msg1, msg2), (out, msg1, msg2))
 
   def testUpdateUpdate(self):