NameError: uninitialized constant ActiveRecord::FixtureSet::RenderContext::Fixtures

I hope someone can help me with this one. I have upgraded a simple app from rails 2.3 to 4.1.6 and got the app going with little difficulty. However when I run the tests using rake test, for every test I get NameError: uninitialized constant ActiveRecord::FixtureSet::RenderContext::Fixtures

I have a simple 4.1.6 app with tests that work ok and can't see any obvious difference in the test setup. test_helper.rb is identical and the settings in environment/test.rb are the same.

Google has failed me. Any suggestions will be gratefully received.

Colin

Why is it that after spending hours looking at a problem, ten minutes after posting a request for help one finds the answer oneself?

The problem was that in one of the fixtures I was using

<%= Fixtures.identify(:...) %>

this has to be changed to

<%= ActiveRecord::FixtureSet.identify(:...) %>

0 out of 10 to rails for a really helpful error message. Problem solved however, sorry for the noise. Perhaps this will be useful to someone else if they get that error. I am still surprised google did not find any reports of others with the same issue.

Cheers

Colin