# 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("WebKitTools", "WebKit")

        self.assertTrue(rel_path is None)