From: Jason Creighton <androflux@...>
Date: 2003-07-02T05:11:12+09:00
Subject: Re: inifinite recursion && test/unit

On Tue, 1 Jul 2003 22:06:46 +0900
Andrey Kulinich <Andrey.Kulinich@itgrp.net> wrote:

> > Neither, it's correct behaviour. If class Recur no longer exists, then the
> > call to 'Recur.new' will refer to the function 'new' in module Recur,
> > which is itself (hence infinitely recursive).
> 
> I was talking about test/unit.
> Why when I'm using it in such code ruby can't detect infinite loop? In 
> my opinion this is test/unit's bug.

Huh? What do you expect Test::Unit to do? Given this input, with
ruby-1.8.0-preview3 and whatever version of test/unit comes with that:

require 'test/unit'

def recursive()
  recursive()
end

class TC_recursive < Test::Unit::TestCase
  def test_recursive
    recursive()
  end
end

....when run, will give this output:

Loaded suite recur
Started
E
Finished in 0.098239 seconds.

  1) Error!!!
test_recursive(TC_recursive):
SystemStackError: stack level too deep
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
<snipped several thousand lines of traceback>
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:6:in `recursive'
    recur.rb:11:in `test_recursive'
    recur.rb:10

1 tests, 0 assertions, 0 failures, 1 errors

What's the problem?

Jason Creighton