tic tac toe with Ruben

TicTacToe.groovy

class Board {
	def fields = ["."]
	
	def mark(token){
		if (fields[0] != ".") {
			throw new RuntimeException("Already Taken!")
		}
		fields[0] = token
	}
}

class Player {
	Board board
	
	def mark(token){
		board.mark(token)
	}
	
}

class Game {
	def fields = ["."]
	Player p1
	Player p2
	Board board
	
	def mark(token) {
		fields[0] = token
	}
	
	def isOver() {
		def empty_fields = fields.findAll { it == "." }
		if (empty_fields.size() > 0) {
			return false
		}
		return true	
	}
}

def when_all_fields_are_empty_then_game_is_not_over() {
	Game game = new Game()
	assert game.isOver() == false
}

def when_all_fields_are_taken_then_the_game_is_over() {
	Game game = new Game()
	game.mark("X")
	assert game.isOver() == true
}

def when_one_field_is_taken_then_other_player_cannot_mark_the_field_again() {
	Board board = new Board()

	Player p1 = new Player([board: board])
	Player p2 = new Player([board: board])

	Game game = new Game([board: board, p1: p1, p2: p2])
	
	p1.mark("X")
	
	try {
		p2.mark("O")
		assert true == false
	} catch (RuntimeException ex) {
		assert ex.getMessage() == "Already Taken!"
	}
}

when_all_fields_are_taken_then_the_game_is_over()
when_all_fields_are_empty_then_game_is_not_over()
when_one_field_is_taken_then_other_player_cannot_mark_the_field_again()