We want to test the behavior write conflicts between multi-statement transactions and writes outside of multi-statement transactions. We should test the following cases:

1. Start a transaction T. then, outside of the transaction, update document D. Then try to write to document D from within transaction T and verify a write conflict occurs.
2. Start a transaction T and write to document D. Then try to do a non-transactional update to D. Verify that this non-transactional write blocks until the transaction has committed, or until maxTimeMS expires.