Question

有人可以帮助一个新手吗？我正在运行以下两个测试，试图最终获得相同的值。然而;当我通过computer_turn方法运行测试时，它给了我一个零值，但是当我直接通过player_first_turn函数运行测试时？它返回值：b2我正在寻找。前者为什么不给我：b2呢？

RSPEC测试。

before(:all) do
  @test_case = ComputerLogic.new
  $user_sign = "X"
  $computer_name = "Watson"
  $computer_sign = "O"
end

context "pertaining to computer_turn" do
  it "should: if player picks corner then computer picks center" do
    possible_places = {a1: "X",a2: @a2,a3: @a3,b1: @b1,b2: @b2,b3: @b3,c1: @c1,c2: @c2,c3: @c3}

    @test_case.computer_turn(possible_places).should == :b2
  end
end

context "pertaining to player_first_turn? and computer_first_move" do
  it "should: if player picks corner then computer picks center" do
    possible_places = {a1: "X",a2: @a2,a3: @a3,b1: @b1,b2: @b2,b3: @b3,c1: @c1,c2: @c2,c3: @c3}

    @test_case.player_first_turn?(possible_places).should == :b2
  end

我正在运行RSPEC测试的功能。

def computer_turn(possible_places)
  if player_first_turn?(possible_places)
  elsif attack
  elsif counter_attack
  elsif fork_play?
  else random_move
  end
end

def player_first_turn?(possible_places)
  @first_turn = possible_places.select { |key, value| value == $user_sign }
  if @first_turn.length == 1
    return computer_first_move
  else
    return false
  end
end

def computer_first_move
  check_center = @first_turn.keys.first
  if check_center == :b2
    move = { a1: @a1,a3: @a3, c1: @c1,c3: @c3 }.keys.sample
    #return declare_computer_move(move)
  else
    move = :b2
    #return declare_computer_move(move)
  end
end

Answer 1

问题在于，如果computer_turn是真实的，nil会返回player_first_turn?(possible_places)，因为if表达式与后续elsif之间没有代码。事实上，computer_move将返回nil，以防条件表达式的任何真实，否则它将返回random_move。

if语句永远不会返回它正在评估的条件的值。它返回条件表达式后面的语句系列或表达式的值，如果没有，则返回nil。

获得Nil Value函数，我正在运行RSpec测试...？

1 个答案: