def test_from_hex(self):
self.assertRaises(AssertionError, Bus._pick_from_hex, 1, [])
self.assertRaises(BusException, Bus._pick_from_hex, "", [("x",1)])
self.assertRaises(BusException, Bus._pick_from_hex, "10", [])
self.assertEqual(Bus._pick_from_hex("10", [("x", 1)]), {"x":16})
self.assertEqual(Bus._pick_from_hex("100010", [("x", 1), ("y", 2)]), {"x":16, "y":16})
