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go-testing

Skill1 starsChanged 51 days agoMITView on GitHub

Trigger: Go tests, go test coverage, Bubbletea teatest, golden files. Apply focused Go testing patterns.

We split this skill into the rules it gives an agent

6 rules. 0 are common, 3 are distinctive, and 3 are very specific to this project.

  • 0

    Common

    Most of the 11 edited versions we read keep these.

  • 3

    Distinctive

    This author's own choices. Worth a look.

  • 3

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Prefer table-driven tests for multiple cases.

    line 16
  2. Distinctive:

    Test behavior and state transitions, not implementation trivia.

    line 17
  3. Very specific:

    Use t.TempDir() for filesystem tests.

    line 18
  4. Very specific:

    Keep integration tests skippable with testing.Short() when they run external commands or slow flows.

    line 19
  5. Distinctive:

    Use small mocks/interfaces around system or command execution boundaries.

    line 22
  6. Distinctive:

    Run the narrow package test first, then the relevant broader suite.

    line 42

“Common” is measured: kept by at least 6 in 10 of the 11 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

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.

Decision Gates

TargetTest pattern
Pure function or parserTable-driven unit test.
Error behaviorExplicit success and failure cases.
File operationst.TempDir() plus focused assertions.
TUI state transitionDirect Model.Update() call with tea.Msg.
Full TUI interactionteatest.NewTestModel().
Rendered outputGolden file test.
Real external commandIntegration test; skip in -short.

Execution Steps

  1. Identify behavior under test and the smallest public boundary that proves it.
  2. Choose the test pattern from the decision gate.
  3. Name cases by scenario, not input mechanics.
  4. Assert outputs, errors, state, and side effects explicitly.
  5. Run the narrow package test first, then the relevant broader suite.
  6. For golden updates: run with -update, inspect diff, then rerun without -update.

Output Contract

Report test files changed, scenarios covered, commands executed, golden files updated, and any skipped integration scope.

References

  • references/examples.md — compact table-driven, Bubbletea, teatest, golden, and command examples.

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