使用ruby抑制输出到控制台 [英] suppresing output to console with ruby

问题描述

我正在写一些单元测试，如下所示：

  def executing_a_signal 
 a_method（a_signal.new，a_model ，a_helper）; 
 assert_equal（new_state，a_model.state）
 end 
  

，但是在断言之前运行以执行逻辑的方法会通过 puts 向控制台输出各种消息。

有没有一个快速，也许内置的方法来抑制输出到控制台？我只对该方法对模型对象的最终效果感兴趣，并且为了保持控制台基本清洁，我希望找到一种方法来简单地防止所有输出到控制台，而不重写或注释掉那些 puts 语句只是为了我的测试。

这绝对不是一个关键问题，

解决方案

我在测试中使用以下代码片段来捕获和测试STDOUT

p>

  def capture_stdout（& block）
 original_stdout = $ stdout 
 $ stdout = fake = StringIO.new 
 begin 
 yield 
确保
 $ stdout = original_stdout 
 end 
 fake.string 
 end 
  
 
 
 
使用此方法，以上将变为：
  def executing_a_signal 
 capture_stdout {a_method（a_signal.new，a_model，a_helper）} 
 assert_equal（new_state，a_model.state）
 end 
  pre> 
I am writing some unit tests like the following:
def executing_a_signal
  a_method(a_signal.new, a_model, a_helper);
  assert_equal(new_state, a_model.state)
end
The tests work fine, but the method which runs just before the assertion to execute the logic prints various messages to the console, mainly via puts.

Is there a quick, perhaps built-in, way to suppress that output to the console? I am only interested in the final effect of the method on the model object, and for the sake of keeping the console clean basically, I was hoping to find a way to simply prevent all output to the console without re-writing or commenting out those puts statements just for my tests.

It is definitely not a critical issue, but would very much like to hear any thoughts or ideas (or workaround) on it.
解决方案
I use the following snippet in tests to capture and test STDOUT
def capture_stdout(&block)
  original_stdout = $stdout
  $stdout = fake = StringIO.new
  begin
    yield
  ensure
    $stdout = original_stdout
  end
  fake.string
end
With this method, the above would become:
def executing_a_signal
  capture_stdout { a_method(a_signal.new, a_model, a_helper) }
  assert_equal(new_state, a_model.state)
end


                        
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