Go Test Quality

Tests are production code. They run in CI on every commit, they document behavior, and they're the first thing you read when a function breaks at 3am. Write them with the same care you'd give to code that handles money.

Community default. A project skill or agent-config rule that explicitly supersedes go-test-quality takes precedence over this one.

Detailed reference material, loaded on demand:

• references/helpers-and-fixtures.md — test helpers, factory functions with options, t.Cleanup, golden files, mock implementations.
• references/integration-testing.md — httptest recorder and server, testcontainers, build tags, TestMain, fuzz testing.
• references/concurrency-and-benchmarks.md — synctest, goleak, t.Context(), b.Loop() benchmarks, t.Attr and artifacts.

Read a reference file only when the summary below is not enough.