modern Ruby VMs have much better alternatives

It got extracted as metaruby and is unmaintained

define_finalizer is now (on ruby 2.1) raising RuntimeError
(instead of ArgumentError) in this case. Catch and re-raise
ArgumentEror

Ruby's bundled minitest version and the gem are out of sync (in general),
which makes Test::Unit break. Simply port to minitest, and while I am
at it use a common template for test setup (from Rock's ruby library
template)

The test block moved, so we need to update the lines