如何使用 RSpec 测试 STDIN [英] how to test STDIN with RSpec

问题描述

好的，需要帮助进行测试.我想测试这个类是否收到一个字母O"和当调用move_computer"方法时，返回该人在 cli 上输入的任何内容.我的心理子处理器告诉我，这是一个简单的将变量分配给某个东西以保存 STDIN 中的随机人工输入的方法.只是现在没有得到它......有人指出我正确的方向吗?

Ok, need help working out a test. I want to test that this class receives a letter "O" and that when called the "move_computer" method returns WHATEVER the person enters on the cli. my mental subprocessor tells me this is a simple assign a variable to something to hold the random human input at STDIN. Just not getting it right now...anyone point me in the right direction?

这是我的课...

class Player
  def move_computer(leter)
    puts "computer move"
    @move = gets.chomp
    return @move
  end
end

我的测试看起来像...

my test look like...

describe "tic tac toe game" do
  context "the player class" do
    it "must have a computer player O" do

      player = Player.new()
      player.stub!(:gets) {"\n"} #FIXME - what should this be?
      STDOUT.should_receive(:puts).with("computer move")
      STDOUT.should_receive(:puts).with("\n") #FIXME - what should this be?
      player.move_computer("O")
    end
  end
end

推荐答案

因为 move_computer returns 输入，我想你的意思是:

Because move_computer returns the input, I think you meant to say:

player.move_computer("O").should == "\n"

我会这样写完整的规范:

I would write the full spec like this:

describe Player do
  describe "#move_computer" do
    it "returns a line from stdin" do
      subject.stub!(:gets) {"penguin banana limousine"}
      STDOUT.should_receive(:puts).with("computer move")
      subject.move_computer("O").should == "penguin banana limousine"
    end
  end
end

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