Add a basic backwards compatibility unittest.

courgette/courgette.gyp

Index: courgette/courgette.gyp
diff --git a/courgette/courgette.gyp b/courgette/courgette.gyp
index e9fa1705ac69777551a1ec5a7efddfdfd42dd0dd..41c8d0ad596b2a986d7c4369c6856284f9ba6777 100644
--- a/courgette/courgette.gyp
+++ b/courgette/courgette.gyp
@@ -1,4 +1,4 @@
-# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Copyright (c) 2011 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.
 
@@ -86,12 +86,15 @@
       'sources': [
         'adjustment_method_unittest.cc',
         'bsdiff_memory_unittest.cc',
+        'base_test_unittest.cc',
+        'base_test_unittest.h',
         'difference_estimator_unittest.cc',
         'encoded_program_unittest.cc',
         'encode_decode_unittest.cc',
         'image_info_unittest.cc',
         'run_all_unittests.cc',
         'streams_unittest.cc',
+        'versioning_unittest.cc',
         'third_party/paged_array_unittest.cc'
       ],
       'dependencies': [
@@ -117,6 +120,8 @@
       'target_name': 'courgette_fuzz',
       'type': 'executable',
       'sources': [
+        'base_test_unittest.cc',
+        'base_test_unittest.h',
         'encoded_program_fuzz_unittest.cc',
        ],
       'dependencies': [