# Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
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"""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)