def test_get_opposite_middle(self):
board = Board()
tile = "B2"
expected_opposite = "B2"
opposite = board.get_opposite(tile)
self.assertEqual(expected_opposite, opposite,
"B2 has no opposite. (Should return itself)")
def test_get_opposite_side(self):
board = Board()
tile = "C2"
expected_opposite = "A2"
opposite = board.get_opposite(tile)
self.assertEqual(expected_opposite, opposite,
"Opposite of A1 should be C3")