def test__combine_paths(self):
t = Transport('/')
self.assertEqual('/home/sarah/project/foo',
t._combine_paths('/home/sarah', 'project/foo'))
self.assertEqual('/etc', t._combine_paths('/home/sarah', '../../etc'))
self.assertEqual('/etc', t._combine_paths('/home/sarah',
'../../../etc'))
self.assertEqual('/etc', t._combine_paths('/home/sarah', '/etc'))
