Arlo Belshee

A simple tool to refactor database schemata by applying ordered migrations. This is mostly a tech demo, showing how to solve two key TDD problems. First, it uses micro-tests as a spec. The tests are both micro-tests and useful acceptance tests in the customer's language. Second, it isolates an annoying dependency—the database—using hexagonal architecture and contract testing.

The port from desktop to cloud was blocked by many internal functions that were written before Windows. They used hardware interrupts in application code to access keyboards and other devices, which wouldn't work on the cloud. I trained the developers working on that project to refactor across such a fundamental shift without altering behavior. They maintained exact functionality, completing the project 75% ahead of schedule, with junior developers, and writing only one bug. No bugs were ever found in their code production.

I built a quick tech demo for a client to teach techniques for better unit testing. This teaches the use of my commit notation, micro-commits, builder pattern, and custom assertions. Combined with a learning hour talk, this spread better unit testing throughout the client organization. They increased the number of unit tests created per day by 50%, and their tests were now readable by POS and abstract enough to support remodeling.