I have done some work over the weekend and backported all the testing and crud files from the Drupal 6 version of CCK back to the Drupal 5 version.
I did this mainly to help with testing of the of the following patch to fix the performance issue in CCK
http://drupal.org/node/246084 => Extremely Poor Performance with CCK fields passing data to database => Content Construction Kit (CCK), content.module, critical, patch (code needs review)
When I did this I think that I also found a bug in the administration of CCK fields seem to be creating tables when it should not be. This maybe the version of the crud file, but I do not think so.
To run this you need the following 3 patches.
http://drupal.org/node/254507 => Backport of helpers for CCK tests => SimpleTest, Code, normal, patch (code needs review)
http://drupal.org/node/254508 => Backport of the crud file from D6 Version => Content Construction Kit (CCK), content.module, normal, patch (code needs review)
http://drupal.org/node/254509 => Backport of CCK tests from Drupal 6 version. => Content Construction Kit (CCK), content.module, normal, patch (code needs review)
Gordon.