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test-tier-selection

Automatic selection of appropriate test tiers based on change scope. Guides unit tests for small changes, full suite for larger changes. Use when running tests, discussing testing strategy, or after code modifications.

personAuthor: jakexiaohubgithub
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Test Tier Selection

Automatic guidance for selecting appropriate test tiers based on change context and scope.

Test Tier Definitions

| Tier | Duration | Scope | When to Run | |------|----------|-------|-------------| | Unit | < 30s | Single function/module | After every code change | | Integration | < 5min | Component interactions | After feature completion | | E2E | < 30min | Full user flows | Before commit/PR |

Decision Matrix

Change Type → Test Tier

| Change Type | Unit | Integration | E2E | |-------------|------|-------------|-----| | Single function fix | Required | Skip | Skip | | New feature (1 file) | Required | Required | Skip | | Multi-file feature | Required | Required | Required | | Refactoring | Required | Required | Optional | | API changes | Required | Required | Required | | UI changes | Required | Optional | Required | | Bug fix (isolated) | Required | Optional | Skip | | Database changes | Required | Required | Required | | Config changes | Required | Required | Optional |

Escalation Signals

Escalate to Integration when:

  • Changes span multiple files
  • Business logic affected
  • Service boundaries modified
  • Database queries changed

Escalate to E2E when:

  • User-facing features modified
  • Authentication/authorization changes
  • Critical path functionality
  • Before creating PR

Commands by Tier

# Tier 1: Unit (fast feedback)
/test:quick

# Tier 2: Integration (feature completion)
/test:full --coverage

# Tier 3: E2E (pre-commit)
/test:full

Agent Consultation Triggers

Consult test-architecture agent when:

  • New feature module created
  • Coverage drops > 5%

  • 3 flaky tests detected

  • Framework questions arise
  • Test strategy needs adjustment

Consult test-runner agent when:

  • Need test execution with analysis
  • Multiple failures to diagnose
  • Want concise failure summary

Consult system-debugging agent when:

  • Integration test failures with unclear cause
  • Environment/timing issues
  • Flaky tests related to concurrency

Quick Reference

After Small Change

1. Run /test:quick
2. If pass: Continue working
3. If fail: Fix immediately

After Feature Completion

1. Run /test:full --coverage
2. Check coverage targets met
3. If gaps: /test:consult coverage

Before Commit/PR

1. Run /test:full
2. All tiers must pass
3. Review coverage report

For New Features

1. /test:consult new-feature
2. Write tests (TDD)
3. Run /test:quick during development
4. Run /test:full before PR

Activation Triggers

This skill auto-activates when:

  • User mentions "test", "run tests", "testing"
  • After code modification by Claude
  • During TDD workflow
  • When /test:* commands invoked
  • When discussing test strategy