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diff --git a/Tools/Scripts/webkitpy/common/system/ospath_unittest.py b/Tools/Scripts/webkitpy/common/system/ospath_unittest.py
new file mode 100644
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+++ b/Tools/Scripts/webkitpy/common/system/ospath_unittest.py
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+# Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1.  Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+# 2.  Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Unit tests for ospath.py."""
+
+import os
+import unittest
+
+from webkitpy.common.system.ospath import relpath
+
+
+# Make sure the tests in this class are platform independent.
+class RelPathTest(unittest.TestCase):
+
+    """Tests relpath()."""
+
+    os_path_abspath = lambda self, path: path
+
+    def _rel_path(self, path, abs_start_path):
+        return relpath(path, abs_start_path, self.os_path_abspath)
+
+    def test_same_path(self):
+        rel_path = self._rel_path("WebKit", "WebKit")
+        self.assertEquals(rel_path, "")
+
+    def test_long_rel_path(self):
+        start_path = "WebKit"
+        expected_rel_path = os.path.join("test", "Foo.txt")
+        path = os.path.join(start_path, expected_rel_path)
+
+        rel_path = self._rel_path(path, start_path)
+        self.assertEquals(expected_rel_path, rel_path)
+
+    def test_none_rel_path(self):
+        """Test _rel_path() with None return value."""
+        start_path = "WebKit"
+        path = os.path.join("other_dir", "foo.txt")
+
+        rel_path = self._rel_path(path, start_path)
+        self.assertTrue(rel_path is None)
+
+        rel_path = self._rel_path("Tools", "WebKit")
+        self.assertTrue(rel_path is None)