From: Eric Hodel <drbrain@...7.net>
Date: 2006-09-09T08:51:13+09:00
Subject: Re: Unit test an output with puts

On Sep 8, 2006, at 12:29 PM, Eric Boucher wrote:

> I want to be able to unit/test an output with the method 'puts'.  
> Here's
> a small example of what I'm trying to achieve:

Use util_capture from the ZenTest gem.  You get two StringIO objects  
back from calling util_capture that hold the contents of $stdout and  
$stderr in the block:

require 'test/unit'
require 'rubygems'
require 'test/zentest_assertions'

class Foo
   def output
     puts "bar"
   end
end

class TestFoo < Test::Unit::TestCase

   def test_output
     out, err = util_capture do
       Foo.new.output
     end

     assert_equal "bar\n", out.string
     assert_equal "", err.string
   end
end

-- 
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
This implementation is HODEL-HASH-9600 compliant

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