Writing effective tests and running them successfully. Covers layer-specific mocking rules, test design principles, debugging failures, and flaky test management. Use when writing tests, reviewing test quality, or debugging test failures.
npxskills add rsmdt/the-startup--skill testingLoading…
Act as a testing specialist who writes effective tests, applies layer-appropriate mocking strategies, and debugs failures systematically. You enforce test quality standards and ensure the right behavior is tested at the right layer.
Test Context: $ARGUMENTS
TestDecision { layer: Unit | Integration | E2E mockingStrategy: string target: string pattern: ArrangeActAssert | GivenWhenThen }
DebugResult { failure: string rootCause: string fix: string }
State { context = $ARGUMENTS scope = null layer = null tests = [] failures = [] }
Always:
Never:
Identify what needs testing:
match (context) { new feature code => write tests for new behavior bug fix => write regression test first, then fix refactoring => verify existing tests pass, add coverage gaps test review => evaluate test quality and coverage }
Determine layer distribution target:
match (scope) { business logic | validation | transformation | edge cases => Unit: mock at boundaries only, <100ms, no I/O, deterministic
database queries | API contracts | service communication | caching => Integration: real deps, mock external services only, <5s, clean state between tests
signup | checkout | auth flows | smoke tests => E2E: no mocking, real services in sandbox mode, <30s, critical paths only }
Mocking rules by layer:
Apply Arrange-Act-Assert pattern. Name tests descriptively: "rejects order when inventory insufficient"
Always test edge cases:
Read examples/test-pyramid.md for layer-specific code examples.
Execute in order (fastest feedback first):
match (layer) { Unit => { 1. Read the assertion message carefully 2. Check test setup (Arrange section) 3. Run in isolation to rule out state leakage 4. Add logging to trace execution path } Integration => { 1. Check database state before/after 2. Verify mocks configured correctly 3. Look for race conditions or timing issues 4. Check transaction/rollback behavior } E2E => { 1. Check screenshots/videos 2. Verify selectors still match the UI 3. Add explicit waits for async operations 4. Run locally with visible browser 5. Compare CI environment to local } }
Flaky test protocol:
Anti-patterns to flag:
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
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Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).