@Test
public void shouldEvaluateNextBoardState() throws Exception {
board = Board.seedWith(LiveCell.at(0, 0), LiveCell.at(1, 0), LiveCell.at(1, 1));
Board next = board.nextState();
assertThat(next.liveCells()).containsOnly(LiveCell.at(0, 0), LiveCell.at(0, 1), LiveCell.at(1, 1), LiveCell.at(1, 0));
}
}