def it_can_put_a_piece(self):
board = ChessBoard()
origin_field = board.get_field(2, 6)
target_field = board.get_field(2, 4)
board.turn |should| equal_to("white")
type(origin_field.piece) |should| be(Pawn)
target_field.piece |should| be(None)
white_pawn = board.get_piece(2, 6)
board.put_piece(white_pawn, 2, 4)
board.turn |should| equal_to("black")
origin_field.piece |should| be(None)
type(target_field.piece) |should| be(Pawn)
