Thomas Sundberg

I started pairing with Claude on Test-Driven Development and Behavior-Driven Development in mid January 2026. I did not know what would happen. The plan was to drop it if Claude slowed me down.

In practice, Claude can join a TDD or BDD cycle. I have used it to draft specifications, write failing tests, make them pass, and refactor afterwards. The output is good enough that I keep coming back to it.

Today I can tell you that I ship faster and that I trust more of my tests. That has less to do with Claude than you might think. A coding assistant amplifies whatever habits you bring. Bad habits get worse. Good habits compound. Mine were already test-first.

I will show examples from real production code. You will see where Claude pulls its weight and where it does not. By the end you should know what AI pairing is worth in test-first work, and what habits you need before you start.