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[Jeroen Vermeulen <jtv@xxxxxxxxxxxxx>]

My reviewer encouraged me to share this with you.

I replaced the various {Fake|Mock}Transaction[Manager] classes in our 
test suite with a single helper, FakeTransaction.  It does what you'd 
expect it to: accept begin(), commit(), and abort() calls and do nothing 
about them.

Well, optionally it can log commit() and abort().  (Not begin() since in 
our code it's usually either not present or not meaningful).

    >>> from lp.testing.faketransaction import FakeTransaction
    >>> txn = FakeTransaction()
    >>> txn.begin()
    >>> txn.commit()
    >>> txn.abort()

    >>> txn = FakeTransaction(log_calls=True)
    >>> txn.begin()
    >>> txn.commit()
    COMMIT
    >>> txn.abort()
    ABORT


Jeroen