write-test

To write unit tests that prevent regressions, target real uncovered behavior across common, boundary, and failure scenarios. Ensure tests are isolated, deterministic, and use minimal dependencies to fail reliably when code regresses.

The best way to structure table-driven tests in Go testing is by inspecting nearby test conventions for naming and fixtures, then defining test cases that assert specific contract behaviors while keeping execution isolated and deterministic.

You need to add regression-focused tests when a function, contract, or behavior currently lacks coverage. Target real bug-risks by asserting happy paths, boundaries, failure modes, and invariants to prevent silent breaks.

Keep test isolation deterministic by minimizing dependencies and utilizing built-in isolation tools like t.TempDir. Ensure checks remain independent so they reliably fail when the underlying code regresses.

Yes, this approach works for complex failure scenarios by explicitly asserting invariants and boundary conditions. It frames the test to catch realistic regressions across common, boundary, and failure modes.

Matching existing test conventions ensures consistency by inspecting nearby tests for naming, fixtures, and assertion style. This minimizes friction and integrates the new regression-focused tests smoothly into the current codebase.