Adding a test to cover XCode UID collisions.

test/mac/gyptest-duplicate-names.py

Index: test/mac/gyptest-duplicate-names.py
===================================================================
--- test/mac/gyptest-duplicate-names.py	(revision 0)
+++ test/mac/gyptest-duplicate-names.py	(revision 0)
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Verifies that a dependency on two gyp files with the same name do not create a
+uid collision in the resulting generated xcode file.
+"""
+
+import TestGyp
+
+import sys
+
+if sys.platform == 'darwin':

[Nico, 2012/09/13 12:07:23]

The test didn't look mac-specific to me. Can you remove this line? (…and send
try jobs?)

[noyau (Ping after 24h), 2012/09/14 12:00:35]

Moved the code out of mac/ into generator-output/ and removed that line. 

+  test = TestGyp.TestGyp(formats=['ninja', 'make', 'xcode'])
+
+  test.run_gyp('test.gyp', chdir='duplicate-names')
+
+  test.pass_test()