check_dups: Add a script to check for the same resource in multiple pak files.

grit/format/check_dups_unittest.py

Index: grit/format/check_dups_unittest.py
diff --git a/grit/format/check_dups_unittest.py b/grit/format/check_dups_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..762edfa7b015481a96eafcad3449104d44d9aab9
--- /dev/null
+++ b/grit/format/check_dups_unittest.py
@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+'''Unit tests for grit.format.check_dups'''
+
+import os
+import sys
+if __name__ == '__main__':
+  sys.path.append(os.path.join(os.path.dirname(__file__), '../..'))
+
+import tempfile
+import unittest
+
+from grit.format import check_dups
+from grit.format import data_pack
+
+class CheckDupsUnittest(unittest.TestCase):
+  def testDuplicateResource(self):
+    first = {1: '', 4: 'this is id 4', 6: 'this is id 6', 10: ''}
+    first_pak = data_pack.WriteDataPackToString(first, data_pack.UTF8)
+    first_file = tempfile.NamedTemporaryFile()
+    first_file.write(first_pak)
+    first_file.flush()
+
+    second = {2: 'resource 2', 3: 'resource 3', 4: 'resource 4'}
+    second_pak = data_pack.WriteDataPackToString(second, data_pack.UTF8)
+    second_file = tempfile.NamedTemporaryFile()
+    second_file.write(second_pak)
+    second_file.flush()
+
+    exception_thrown = False
+    try:
+      check_dups.CheckDupResource([first_file.name, second_file.name])
+    except check_dups.ResourceDuplicateException:
+      exception_thrown = True
+    self.failUnless(exception_thrown)
+
+
+if __name__ == '__main__':
+  unittest.main()