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diff --git a/src/engine/SCons/Tool/PharLapCommonTests.py b/src/engine/SCons/Tool/PharLapCommonTests.py
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+++ b/src/engine/SCons/Tool/PharLapCommonTests.py
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+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "src/engine/SCons/Tool/PharLapCommonTests.py 4577 2009/12/27 19:44:43 scons"
+
+import unittest
+import os.path
+import os
+import sys
+
+import SCons.Errors
+from SCons.Tool.PharLapCommon import *
+
+class PharLapCommonTestCase(unittest.TestCase):
+    def test_addPathIfNotExists(self):
+        """Test the addPathIfNotExists() function"""
+        env_dict = { 'FOO' : os.path.normpath('/foo/bar') + os.pathsep + \
+                     os.path.normpath('/baz/blat'),
+                     'BAR' : os.path.normpath('/foo/bar') + os.pathsep + \
+                     os.path.normpath('/baz/blat'),
+                     'BLAT' : [ os.path.normpath('/foo/bar'),
+                                os.path.normpath('/baz/blat') ] }
+        addPathIfNotExists(env_dict, 'FOO', os.path.normpath('/foo/bar'))
+        addPathIfNotExists(env_dict, 'BAR', os.path.normpath('/bar/foo'))
+        addPathIfNotExists(env_dict, 'BAZ', os.path.normpath('/foo/baz'))
+        addPathIfNotExists(env_dict, 'BLAT', os.path.normpath('/baz/blat'))
+        addPathIfNotExists(env_dict, 'BLAT', os.path.normpath('/baz/foo'))
+
+        assert env_dict['FOO'] == os.path.normpath('/foo/bar') + os.pathsep + \
+               os.path.normpath('/baz/blat'), env_dict['FOO']
+        assert env_dict['BAR'] == os.path.normpath('/bar/foo') + os.pathsep + \
+               os.path.normpath('/foo/bar') + os.pathsep + \
+               os.path.normpath('/baz/blat'), env_dict['BAR']
+        assert env_dict['BAZ'] == os.path.normpath('/foo/baz'), env_dict['BAZ']
+        assert env_dict['BLAT'] == [ os.path.normpath('/baz/foo'),
+                                     os.path.normpath('/foo/bar'),
+                                     os.path.normpath('/baz/blat') ], env_dict['BLAT' ]
+
+if __name__ == "__main__":
+    suite = unittest.makeSuite(PharLapCommonTestCase, 'test_')
+    if not unittest.TextTestRunner().run(suite).wasSuccessful():
+        sys.exit(1)
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: