def test_next(self):
p = Path((1, 2, 3))
self.assert_(p.next(), (1, 2, 4))
def test_child(self):
p = Path((1, 2, 3))
self.assert_(p.child(), (1, 2, 3, 0))
def test_parent(self):
p = Path((1, 2, 3))
self.assert_(p.parent(), (1, 2))
def test_prev(self):
p = Path((1, 2, 3))
self.assert_(p.prev(), (1, 2, 2))
