From ce
Writes behavior-focused tests using Testing Trophy model: integration first with real dependencies, minimal mocking. For writing tests, choosing types, or avoiding anti-patterns.
npx claudepluginhub rileyhilliard/claude-essentials --plugin ceThis skill uses the workspace's default tool permissions.
**Core principle:** Test user-observable behavior with real dependencies. Tests should survive refactoring.
Generates design tokens/docs from CSS/Tailwind/styled-components codebases, audits visual consistency across 10 dimensions, detects AI slop in UI.
Records polished WebM UI demo videos of web apps using Playwright with cursor overlay, natural pacing, and three-phase scripting. Activates for demo, walkthrough, screen recording, or tutorial requests.
Delivers idiomatic Kotlin patterns for null safety, immutability, sealed classes, coroutines, Flows, extensions, DSL builders, and Gradle DSL. Use when writing, reviewing, refactoring, or designing Kotlin code.
Core principle: Test user-observable behavior with real dependencies. Tests should survive refactoring.
"The more your tests resemble the way your software is used, the more confidence they can give you." — Kent C. Dodds
Why this matters: Tests exist to give you confidence. The Testing Trophy prioritizes integration tests because they test real behavior across real modules — giving maximum confidence per test written. Unit tests in isolation often just test mocks, not your actual system.
| Priority | Type | When |
|---|---|---|
| 1st | Integration | Default - multiple units with real dependencies |
| 2nd | E2E | Complete user workflows |
| 3rd | Unit | Pure functions only (no dependencies) |
Default: Don't mock. Use real dependencies.
Only mock:
Never mock:
Before mocking, ask: "What side effects does this have? Does my test need those?" If unsure, run with real implementation first, then add minimal mocking only where needed.
Complete user workflow? → E2E test
Pure function (no side effects)? → Unit test
Everything else → Integration test
| Context | Assert On | Avoid |
|---|---|---|
| UI | Visible text, roles | CSS classes, internal state |
| API | Response body, status | Internal DB state |
| Library | Return values | Private methods |
| Pattern | Fix |
|---|---|
| Testing mock calls | Test actual outcome |
| Test-only methods in production | Move to test utilities |
sleep(500) | Use condition-based waiting |
| Asserting on internal state | Assert on observable output |
| Incomplete mocks | Mirror real API completely |
For flaky tests with timing issues, use Skill(ce:condition-based-waiting).
Remember: Behavior over implementation. Real over mocked. Outputs over internals.