GuideTechnology
12 min read
Turn the tests from the earlier articles into a strategy: unit tests, slice tests (@WebMvcTest, @DataJpaTest, @JsonTest), full integration tests on a real PostgreSQL, measured run times, coverage with JaCoCo, and a mutation experiment that shows which tests really protect you.
GuideTechnology
30 min read
Take the Expense Tracker CLI and add a PostgreSQL repository behind the same interface: an idempotent schema, a transactional bulk import, a connection pool, one shared contract test for every implementation, a fat jar, and an honest review.
GuideTechnology
10 min read
AI-written code often passes AI-written tests, because both come from the same assumptions. This article shows how to write tests that check what the code should do, how to use AI as a second reviewer without relying on it, what to look for in AI-generated diffs, and how to refactor safely.
GuideTechnology
9 min read
Pasting an error into an assistant can solve a bug in a minute, or produce a patch that hides it. This article gives a safe debugging workflow: reproduce, share safely, ask for hypotheses, test them, review the fix, add a regression test, with a worked example and a list of dangerous 'fixes'.
