From: dblack@...
Date: 2003-05-24T07:19:24+09:00
Subject: Re: Test::Unit assert_raises issues 1.6.8 => 1.8

Hi --

On Sat, 24 May 2003, Warren Brown wrote:

>     I have some test cases in Ruby version 1.6.8 that are of the form:
>
> class Foo; end
> assert_raises(NameError) { Foo.undefinedmethod }
>
>     Basically, I want to make sure that a particular operation (i.e. method
> invocation) does *not* work and raises an exception.
>
>     Apparently in Ruby 1.8, the exception raised in this case has been
> changed to NoMethodError.  It is easy enough for me to go and change all of
> the occurrences of "assert_raises(NameError)" to
> "assert_raises(NoMethodError)", to make this work under 1.8, but I really
> would like to have the test cases work under both 1.6.8 and 1.8.
>
>     Since the Exception class name is a required parameter for
> Test::Unit#assert_raises it looks like I am going to have to create a
> constant somewhere like:
>
> NoMethodException = (VERSION == 1.8) ? NoMethodError : NameError
>
>     ... and then use that constant instead of the actual exception name:
>
> assert_raises(NoMethodException) { ... }
>
>     This will work, but is messy.

How about something like this:

  require 'test/unit'

  if VERSION < "1.8"
    NoMethodError = NameError
  end

  class T < Test::Unit::TestCase
    def testme
      assert_raises(NoMethodError) { 1.blah }
    end
  end


David

-- 
David Alan Black
home: dblack@superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav