Activation Contract

Load this skill when writing or reviewing Go tests, adding coverage, testing Bubbletea/TUI flows, using teatest, or updating golden files.

Hard Rules

Prefer table-driven tests for multiple cases; use t.Run(tt.name, ...).
Test behavior and state transitions, not implementation trivia.
Use t.TempDir() for filesystem tests; never rely on a real home directory.
Keep integration tests skippable with testing.Short() when they run external commands or slow flows.
For Bubbletea, test Model.Update() directly for state changes; use teatest only for interactive flows.
Golden files must be deterministic; update only through the repo's -update path and rerun tests without -update.
Use small mocks/interfaces around system or command execution boundaries.