> my first test was along the lines of “it can categorise a single transaction correctly”... I was attempting a more “top down” design strategy here. Sounds ri

> my first test was along the lines of “it can categorise a single transaction correctly”... I was attempting a more “top down” design strategy here. Sounds right to me! I usually start projects/features with a test that covers the end-to-end behavior I want to see. When you have no other tests, a smoke test is the highest value test you can add because it measures the thing you care about.