From: Eric Hodel <drbrain@...7.net>
Date: 2009-05-27T05:47:03+09:00
Subject: Re: Test::Unit : assert_aborts

On May 23, 2009, at 21:54, Stephan Wehner wrote:

> class Test::Unit::TestCase
>  def assert_aborts(msg_or_pattern)
>    asserted = false
>    caught_exception = 'none'
>    begin
>      yield if block_given? # if there is no block, there will not be
> any abort
> either
>    rescue AbortException => e
>      caught_exception = e
>      if msg_or_pattern.is_a? String
>        assert_equal msg_or_pattern, e.to_s.sub(/^[a-z_]*: /,'')
>        return
>      end
>      if msg_or_pattern.is_a? Regexp
>        assert_match msg_or_pattern, e.to_s
>        return
>      end
>    end
>    flunk "Expected to handle abort with >>#{ msg_or_pattern }<<.  
> Caught
> exception >>#{ caught_exception }<< but didn't handle"
>  end
> end
>
> module Kernel
>  def abort(msg)
>    raise AbortException.new(msg)
>  end
> end

You're doing far, far too much work!

$ ruby -rstringio -e '$stderr = StringIO.new; begin; abort "hi";  
rescue Exception; p $!; end'
#<SystemExit: hi>

Capturing $stderr (then ignoring it) and checking if SystemExit is  
raised and has the right message is enough:

$ cat test.rb
require 'minitest/autorun'

class TestA < MiniTest::Unit::TestCase
   def assert_aborts(message)
     e = assert_raises SystemExit do
       capture_io do
         yield
       end
     end

     assert_equal message, e.message
   end

   def test_a
     assert_aborts "hi" do
       abort "hi"
     end
   end
end
$ ruby19 test.rb
Loaded suite test
Started
.
Finished in 0.001654 seconds.

1 tests, 2 assertions, 0 failures, 0 errors, 0 skips