Ruby on Rails

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

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