From: Doug Glidden <41mortimer@...>
Date: 2008-08-27T23:24:23+09:00
Subject: Re: assert_raise question

[snip]
> ### Begin test.rb ###
> require 'test/unit'
> class TestRaise < Test::Unit::TestCase
>   def test_raise
>     assert_raise(ArgumentError){raise ArgumentError.new("basic argument
> issue")}
>   end
>   def test_raise_parent
>     assert_raise(StandardError){raise ArgumentError.new("basic argument
> issue")}
>   end
> end
> ###  End test.rb  ###
[snip]

This is a somewhat unrelated question, but in playing around with this, 
I discovered something odd.  The test_raise method above works, but the 
following modification of it does not:

def test_raise
  assert_raise ArgumentError {raise ArgumentError.new("basic argument 
issue")}
end

Now there's suddenly an Exception: undefined method 'ArgumentError'... 
I was more than a little surprised to discover that the parens make a 
difference here?  Can anyone explain to me _why_ there's a difference?

Doug
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