Upgrading project to Rails 2. New generated functional tests fail

When running the command

'./script/generate scaffold SkillCategory name:text'

in a new Rails project, I get nicely generated code that passes all its tests

When running the same code in my updated project the same code is generated but four of the functional tests fail. The project has been upgraded by using 'rake rails:update'

The error messages are

test_should_destroy_skill_category(SkillCategoriesControllerTest): NoMethodError: undefined method `skill_categories' for #<SkillCategoriesControllerTest:0x19c7628>     /Library/Ruby/Gems/1.8/gems/actionpack-2.0.2/lib/action_controller/ test_process.rb:464:in `method_missing'     ./test/functional/skill_categories_controller_test.rb:40:in `test_should_destroy_skill_category'     /Library/Ruby/Gems/1.8/gems/activesupport-2.0.2/lib/active_support/ core_ext/test/unit/assertions.rb:39:in `assert_difference'

Any ideas why this might be happening

Many thanks


Problem solved, though not sure exactly how. Migrating more carefully following guidelines from Upgrading to Rails 2.0. A Recipe - SitePoint seem to have solved it. Other possible cause was newby use of Git and mixing of old and new branches.