From: John Barnette <jbarnette@...>
Date: 2009-09-02T16:40:37+09:00
Subject: Re: minitest assert_throws, why rescue?

On Sep 2, 2009, at 12:12 AM, Intransition wrote:
> In minitest why does assert_throws rescue ArgumentError/NameError ?

NameError (or ArgumentError on 1.9) is what's raised by Kernel#throw  
when there's no catch block for the thrown symbol.


~ j.


>
>  def assert_throws sym, msg = nil
>      default = "Expected #{mu_pp(sym)} to have been thrown"
>      caught = true
>      catch(sym) do
>        begin
>          yield
>        rescue ArgumentError => e     # 1.9 exception
>          default += ", not #{e.message.split(/ /).last}"
>        rescue NameError => e         # 1.8 exception
>          default += ", not #{e.name.inspect}"
>        end
>        caught = false
>      end
>
>      assert caught, message(msg) { default }
>    end
>
> Thanks.
>