validations running twice from rake:integration

I'm working on upgrading my app to the 1-2-pre-release branch and am
noticing that when I run rake test:integration my model validations are
running twice.

I can tell this because when I output errors, I get the same validation
messages twice. When I run the same test classes not via rake (e.g.
"ruby test/integration/sometest.rb"), they pass and validation errors
only appear once.

Any ideas what might be causing this?

Cheers from NYC,
Luke

Solved my own problem. It turned out to be caused by a separate
integration test was errantly "require"-ing my model file. -Luke