From: Jano Svitok <jan.svitok@...>
Date: 2007-07-03T06:23:30+09:00
Subject: Re: Testing for warnings

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.