Tests broken after freeze and upgrade - undefined method

I have a problem where I can’t run tests on a rails app that was written
for rails 1.0.

Sequence of events was this:

Develop Application1 on Rails 1.0 / Ruby 1.8.2

Freeze rails into vendor folder on Application1

Develop Application2 on Rails 1.1 / Ruby 1.8.4

Return to Application1 and run tests, every test fails with the error
“undefined method `verify_active_connections!” or in detail …

  1. Error:
    NoMethodError: undefined method verify_active_connections!' for ActiveRecord::Base:Class D:/svn_dbi/config/../vendor/rails/activerecord/lib/active_record/base.rb:996:inmethod_missing’

The result is the same regardless of whether I run rake or invoke a test
file directly.

The app itself runs fine in webbrick, it’s just the tests that are

What seems to happening is that despite the freeze, the latest version
(non-frozen) of ActiveRecord is being used
(activerecord-1.14.2/lib/active_record/fixtures.rb) to call other code
(ActiveRecord code ?) in the frozen vendor folder.

Presumably something in the test suite directly invokes a particular
version of ActiveRecord ?

Any pointers to how to get this fixed much appreciated.

Cheers, Andy