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Yes, it is possible to undo ActiveRecord transactions in Rails testing without causing an error to occur. One way to achieve this is by using the transactional_fixtures feature in Rails, which wraps each test in a transaction that is rolled back at the end of the test. This ensures that the database is always in a known state before each test and avoids any conflicts or unforeseen errors. Another way to undo transactions is to use the rollback method within the test code itself, which allows you to roll back the transaction at specific points in the test. This can be useful if you need to test multiple scenarios within the same test and want to reset the database after each scenario.