From: Alex Gutteridge <alexg@...>
Date: 2007-07-03T08:45:34+09:00
Subject: Re: Testing for warnings

On 3 Jul 2007, at 06:23, Jano Svitok wrote:

> On 7/2/07, Alex Gutteridge <alexg@kuicr.kyoto-u.ac.jp> wrote:
>> Is there a way of asserting that a warning is raised in a unit test?
>> So I could write something like:
>>
>> assert_warns "Blah blah" do function_that_warns(foo) end
>>
>> I can't seem to find anything in the test/unit docs, but it seems
>> like something that would be relatively common to test for...
>
> You may try to write that yourself by replacing Kernel#warn, though
> this way you cannot check warnings from C code. Alternatively you
> could replace/capture $stderr/STDERR and look for warnings there.

I specifically need to check for warnings from C code so replacing  
Kernel#warn won't work. I will try hooking into STDERR though -  
thanks for the idea.

Alex Gutteridge

Bioinformatics Center
Kyoto University