[ruby-core:55794] how to run ruby tests (backporting fix for cve-2013-4073)

Hi ruby core developers,

I am trying to backport fix for cve-2013-4073 (hostname check bypassing
vulnerability in SSL client) to ruby-1.8.6.

By reading the code, I've been able to write a patch (see attachment)
but I don't known how to run the test suite, so that I can think of
adding a new test and check there is no regressions.

So far I tried:

ruby test/runner.rb

but I get the error message:

test/runner.rb:4: private method `scan' called for nil:NilClass
(NoMethodError)

I think the trouble is in the 3rd line:

rcsid = %w$Id$

$Id$ resolts to nil.

Thus, what am I missing? ruby version?

thanks