Skill

testing-strategy

Use when designing test architecture, building API test suites, validating API contracts, setting up component or E2E testing, managing test data, debugging flaky tests, reviewing coverage strategy, or organizing test files. Covers test pyramid, mocking (MSW), frontend (React Testing Library, Playwright), and CI integration.

Install

npx claudepluginhub srstomp/pokayokay --plugin pokayokay

Tool Access

This skill uses the workspace's default tool permissions.

Preview

Comprehensive testing guidance for test architecture, coverage strategy, and test design.

Supporting Assets

SKILL.md

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Last CommitFeb 8, 2026

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Testing Strategy

Comprehensive testing guidance for test architecture, coverage strategy, and test design.

Test Pyramid

Level	Speed	Cost	Confidence	Share
Unit	~1ms	Low	Narrow	65-80%
Integration	~100ms	Medium	Medium	15-25%
Contract	~10ms	Low	API shape	Part of unit
E2E	~1s+	High	Broad	5-10%

Key Principles

Test behavior, not implementation — test what code does, not how
Follow the testing pyramid — more unit tests, fewer E2E
Use meaningful coverage metrics — branch coverage over line coverage
Prevent flaky tests — no arbitrary waits, no test interdependence

Quick Start Checklist

Choose test framework (Vitest recommended for new projects)
Design test folder structure mirroring source
Write unit tests for pure logic and utilities
Add integration tests for API endpoints and data flows
Add contract tests against OpenAPI spec (if applicable)
Add E2E tests for critical user journeys only
Set up CI to run tests on every PR

What NOT to Test

Framework internals (React rendering, Express routing)
Third-party library behavior
Trivial getters/setters with no logic
Implementation details (private methods, internal state)

References

Reference	Description
test-architecture-structure.md	Project structures, shared utilities, test configuration
test-architecture-isolation.md	Playwright config, database isolation, performance optimization
test-design-techniques.md	Equivalence partitioning, boundary values, decision tables, state transitions
test-design-error-and-advanced.md	Error handling tests, property-based testing, parameterization, regression
frontend-react-testing.md	React Testing Library, queries, user events, hooks, forms
frontend-vue-a11y-visual.md	Vue Test Utils, accessibility, visual/Storybook testing, anti-patterns
e2e-playwright.md	Playwright POM, fixtures, auth state, API mocking, visual comparison
e2e-cypress-and-stability.md	Cypress patterns, flaky test prevention, test data, debugging
mocking-fundamentals.md	Mock decision tree, stubs/mocks/spies/fakes, MSW setup and usage
mocking-modules-and-patterns.md	Module mocking, time mocking, anti-patterns, dependency injection
coverage-guide.md	Coverage metrics, meaningful thresholds, CI integration
api-test-frameworks-setup.md	Vitest and Jest setup, configuration, running tests
api-test-supertest-and-helpers.md	Supertest usage, request helpers, custom matchers, snapshots, debugging
api-integration-patterns.md	CRUD endpoint tests, relationship tests
api-auth-patterns.md	Login/logout, protected routes, authorization, auth helpers
api-e2e-and-edge-cases.md	Multi-step workflow tests, error responses, edge cases
api-test-data-factories.md	Factory patterns, builders, fixtures
api-test-data-database.md	Database helpers, cleanup strategies, data generation
api-contract-openapi.md	OpenAPI/AJV schema validation, contract tests
api-contract-zod-advanced.md	Zod validation, response shape testing, breaking change detection
api-test-ci-pipelines.md	CI pipeline strategy, GitHub Actions, parallel execution
api-test-ci-environments.md	Environment config, test reporting, database services, E2E environments
anti-rationalization.md	Iron Law, common rationalizations, red flag STOP list for TDD discipline

Testing Strategy

Comprehensive testing guidance for test architecture, coverage strategy, and test design.

Test Pyramid

Level

Speed

Cost

Confidence

Unit

~1ms

Low

Narrow

65-80%

Integration

~100ms

Medium

15-25%

Contract

~10ms

Low

API shape

Part of unit

E2E

~1s+

High

Broad

5-10%

Key Principles

Test behavior, not implementation — test what code does, not how

Follow the testing pyramid — more unit tests, fewer E2E

Use meaningful coverage metrics — branch coverage over line coverage

Prevent flaky tests — no arbitrary waits, no test interdependence

Quick Start Checklist

Choose test framework (Vitest recommended for new projects)

Design test folder structure mirroring source

Write unit tests for pure logic and utilities

Add integration tests for API endpoints and data flows

Add contract tests against OpenAPI spec (if applicable)

Add E2E tests for critical user journeys only

Set up CI to run tests on every PR

What NOT to Test

Framework internals (React rendering, Express routing)

Third-party library behavior

Trivial getters/setters with no logic

Implementation details (private methods, internal state)

References

Reference

Description

test-architecture-structure.md

Project structures, shared utilities, test configuration

test-architecture-isolation.md

Playwright config, database isolation, performance optimization

test-design-techniques.md

Equivalence partitioning, boundary values, decision tables, state transitions

test-design-error-and-advanced.md

Error handling tests, property-based testing, parameterization, regression

frontend-react-testing.md

React Testing Library, queries, user events, hooks, forms

frontend-vue-a11y-visual.md

Vue Test Utils, accessibility, visual/Storybook testing, anti-patterns

e2e-playwright.md

Playwright POM, fixtures, auth state, API mocking, visual comparison

e2e-cypress-and-stability.md

Cypress patterns, flaky test prevention, test data, debugging

mocking-fundamentals.md

Mock decision tree, stubs/mocks/spies/fakes, MSW setup and usage

mocking-modules-and-patterns.md

Module mocking, time mocking, anti-patterns, dependency injection

coverage-guide.md

Coverage metrics, meaningful thresholds, CI integration

api-test-frameworks-setup.md

Vitest and Jest setup, configuration, running tests

api-test-supertest-and-helpers.md

Supertest usage, request helpers, custom matchers, snapshots, debugging

api-integration-patterns.md

CRUD endpoint tests, relationship tests

api-auth-patterns.md

api-e2e-and-edge-cases.md

Multi-step workflow tests, error responses, edge cases

api-test-data-factories.md

Factory patterns, builders, fixtures

api-test-data-database.md

Database helpers, cleanup strategies, data generation

api-contract-openapi.md

OpenAPI/AJV schema validation, contract tests

api-contract-zod-advanced.md

Zod validation, response shape testing, breaking change detection

api-test-ci-pipelines.md

CI pipeline strategy, GitHub Actions, parallel execution

api-test-ci-environments.md

Environment config, test reporting, database services, E2E environments

anti-rationalization.md

Iron Law, common rationalizations, red flag STOP list for TDD discipline