我通过将 $stout 重定向到文本文件来抑制我的类中的 puts 输出.这样，如果我出于任何原因需要查看输出，它就在那里，但不会混淆我的测试结果.

I suppress puts output in my classes by redirecting $stout to a text file. That way, if I need to see the output for any reason, it is there but it doesn't muddy up my test results.

#spec_helper.rb
RSpec.configure do |config|
  config.before(:all, &:silence_output)
  config.after(:all,  &:enable_output)
end

public
# Redirects stderr and stout to /dev/null.txt
def silence_output
  # Store the original stderr and stdout in order to restore them later
  @original_stderr = $stderr
  @original_stdout = $stdout

  # Redirect stderr and stdout
  $stderr = File.new(File.join(File.dirname(__FILE__), 'dev', 'null.txt'), 'w')
  $stdout = File.new(File.join(File.dirname(__FILE__), 'dev', 'null.txt'), 'w')
end

# Replace stderr and stdout so anything else is output correctly
def enable_output
  $stderr = @original_stderr
  $stdout = @original_stdout
  @original_stderr = nil
  @original_stdout = nil
end

为了回应@MyronMarston 的评论，将方法作为块直接插入 before 和 after 可能会更聪明.

In response to the comment by @MyronMarston, it probably would be smarter to just insert the methods directly into before and after as blocks.

#spec_helper.rb
RSpec.configure do |config|
  original_stderr = $stderr
  original_stdout = $stdout
  config.before(:all) do 
    # Redirect stderr and stdout
    $stderr = File.new(File.join(File.dirname(__FILE__), 'dev', 'null.txt'), 'w')
    $stdout = File.new(File.join(File.dirname(__FILE__), 'dev', 'null.txt'), 'w')
  end
  config.after(:all) do 
    $stderr = original_stderr
    $stdout = original_stdout
  end
end

它看起来更简洁一些，并且保持方法不在 main 之外.另外，请注意，如果您使用的是 Ruby 2.0，则可以使用 __dir__ 而不是 File.dirname(__FILE__).

It looks a little cleaner and keeps methods off of main. Also, note that if you are using Ruby 2.0, you can use __dir__ instead of File.dirname(__FILE__).

EDIT2

还应该提到的是，您可以使用 File::NULL 转发到真正的操作系统 /dev/null，因为它是在 Ruby v 1.9.3 中引入的.(jruby 1.7)

Also it should be mentioned, that you can forward to true os /dev/null by using File::NULL as it was introduced in Ruby v 1.9.3. (jruby 1.7)

然后代码片段将如下所示:

Then the code snippet will look as following:

#spec_helper.rb
RSpec.configure do |config|
  original_stderr = $stderr
  original_stdout = $stdout
  config.before(:all) do
    # Redirect stderr and stdout
    $stderr = File.open(File::NULL, "w")
    $stdout = File.open(File::NULL, "w")
  end
  config.after(:all) do
    $stderr = original_stderr
    $stdout = original_stdout
  end
end