It always pays to test your codebase regularly and I have finally got to the point where I can test the transaction logging code and you'd be surprised with the amount of code I have had to write in order to get this far!
However it has also been such a surprise to find that most of the transaction log writing code worked without modification! The only part requiring work was the class responsible for providing a virtual file-system over a stream - this object is crucial for dividing the backing storage used for transaction logs into smaller chunks. It had a problem where it was reporting the stream position incorrectly which led to all plenty of unrelated problems...
So the writing of transaction log records is working but the recovery process still remains untested but in order to conclude that portion of the application I will need to get to a point where the cache writer is correctly saving logged pages and that means I will be retesting the buffer class state-machine which until recently had a few too many states!
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