Using Rails 3.1.x, DatabaseCleaner gem and capybara 2, I get the following when trying to run tests:
Failure/Error: Unable to find matching line from backtrace ActiveRecord::StatementInvalid: Mysql2::Error: Table 'teambox_test_default.incoming_emails' doesn't exist: TRUNCATE TABLE incoming_emails # ./config/initializers/connection_fix.rb:24:in `execute'
source share