Rails - Oct 2014 - 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

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