This isn't a fully fledged design document. This is meant as a starter for discussion. Please add comments as you see necessary.

What I would like to see is comprehensive integration testing of validation.

Features of that test framework would be:

The ability to run each sub-section from a Class instanciation OR a command line alternative.
1. This would allow files to be fed in at one end of the process, and pop out at the other end
An integration test database which is a skinny copy of production; at the beginning of each test, the database is checkpointed and roll-backed.
Anonymized data.

Browser not supported