How to use the pathlib2.PurePosixPath function in pathlib2

def test_different_flavours_unordered(self):
        p = pathlib.PurePosixPath('a')
        q = pathlib.PureWindowsPath('a')
        with self.assertRaises(TypeError):
            p < q
        with self.assertRaises(TypeError):
            p <= q
        with self.assertRaises(TypeError):
            p > q
        with self.assertRaises(TypeError):
            p >= q

self.assertEqual(pp, p)
            self.assertEqual(hash(pp), hash(p))
            self.assertEqual(str(pp), str(p))

    # note: this is a new test not part of upstream
    # test that unicode works on Python 2
    @unittest.skipIf(
        six.unichr(0x0100).encode(
            sys.getfilesystemencoding(), "replace") == b"?",
        "file system encoding only supports ascii")
    def test_unicode(self):
        self.cls(six.unichr(0x0100))


class PurePosixPathTest(_BasePurePathTest, unittest.TestCase):
    cls = pathlib.PurePosixPath

    def test_root(self):
        P = self.cls
        self.assertEqual(P('/a/b').root, '/')
        self.assertEqual(P('///a/b').root, '/')
        # POSIX special case for two leading slashes
        self.assertEqual(P('//a/b').root, '//')

    def test_eq(self):
        P = self.cls
        self.assertNotEqual(P('a/b'), P('A/b'))
        self.assertEqual(P('/a'), P('///a'))
        self.assertNotEqual(P('/a'), P('//a'))

    def test_as_uri(self):
        P = self.cls

def test_different_flavours_unequal(self):
        p = pathlib.PurePosixPath('a')
        q = pathlib.PureWindowsPath('a')
        self.assertNotEqual(p, q)