Question

我无法理解如何使用puts测试输出。我需要知道在RSPEC文件中需要做什么。

这是我的RSPEC文件：

require 'game_io'
require 'board'


describe GameIO do
  before(:each) do
    @gameio = GameIO.new
    @board  = Board.new
  end

  context 'welcome_message' do
    it 'should display a welcome message' do
      test_in   = StringIO.new("some test input\n")
      test_out  = StringIO.new
      test_io   = GameIO.new(test_in, test_out)

      test_io.welcome_message
      test_io.game_output.string.should == "Hey, welcome to my game. Get ready to be defeated"
    end
  end

end

这是它正在测试的文件：

class GameIO
  attr_reader :game_input, :game_output
  def initialize(game_input = $stdin, game_output = $stdout)
    @stdin  = game_input
    @stdout = game_output
  end


  def welcome_message 
    output "Hey, welcome to my game. Get ready to be defeated" 
  end


  def output(msg)
    @stdout.puts msg
  end

  def input
    @stdin.gets
  end

end

注意：我更新了我的RSPEC代码，以反映我在其他地方找到的建议后对我的测试文件所做的更改。为了完全解决这个问题，我在我的主文件中使用了Chris Heald建议的更改。谢谢大家，谢谢Chris。

Answer 1

请检查您是否正在向其发送消息：

@gameio.should_receive(:puts).with("Hey, welcome to my game. Get ready to be defeated")

Answer 2

您的初始化程序应为：

def initialize(game_input = $stdin, game_output = $stdout)
  @game_input  = game_input
  @game_output = game_output
end

原因是attr_accessor生成如下方法：

# attr_accessor :game_output
def game_output
  @game_output
end

def game_output=(output)
  @game_output = output
end

（attr_reader仅生成阅读器方法）

因此，由于您从未指定@game_output，因此您的game_output方法将始终返回nil。

Answer 3

你可以存根并打印。

也许最基本的方法是暂时将STDOUT重新分配给变量，并确认变量与您对输出的预期相符。

Minitest有must_output作为断言/规范。

因此代码是：

 ##
 # Fails if stdout or stderr do not output the expected results.
 # Pass in nil if you don't care about that streams output. Pass in
 # "" if you require it to be silent. Pass in a regexp if you want
 # to pattern match.
 #
 # NOTE: this uses #capture_io, not #capture_subprocess_io.
 #
 # See also: #assert_silent

 def assert_output stdout = nil, stderr = nil
   out, err = capture_io do
     yield
   end

   err_msg = Regexp === stderr ? :assert_match : :assert_equal if stderr
   out_msg = Regexp === stdout ? :assert_match : :assert_equal if stdout

   y = send err_msg, stderr, err, "In stderr" if err_msg
   x = send out_msg, stdout, out, "In stdout" if out_msg

   (!stdout || x) && (!stderr || y)
 end

rspec提出输出测试

3 个答案: