Entry point:
/faion-net— invoke this skill for automatic routing to the appropriate domain.
Testing Developer Skill
Testing strategies and implementation covering unit tests, integration tests, E2E tests, TDD workflow, and testing best practices.
Purpose
Handles all aspects of software testing including test design, implementation, mocking, fixtures, and testing frameworks.
Context Discovery
Auto-Investigation
Detect testing setup from project:
| Signal | How to Check | What It Tells Us |
|---|---|---|
pytest.ini or pyproject.toml [tool.pytest] | Glob("**/pytest.ini") | pytest used |
conftest.py | Glob("**/conftest.py") | pytest fixtures exist |
jest.config.* | Glob("**/jest.config.*") | Jest used |
vitest.config.* | Glob("**/vitest.config.*") | Vitest used |
*_test.go | Glob("**/*_test.go") | Go tests exist |
playwright.config.* | Glob("**/playwright.config.*") | E2E with Playwright |
cypress/ | Glob("**/cypress/**") | E2E with Cypress |
| Coverage config | Grep("coverage", "**/package.json") | Coverage enabled |
Read existing patterns:
- Check existing tests for patterns (AAA, fixtures)
- Read conftest.py for shared fixtures
- Check CI for test commands
Discovery Questions
Q1: Testing Goal
question: "What testing help do you need?"
header: "Goal"
multiSelect: false
options:
- label: "Write tests for existing code"
description: "Add test coverage"
- label: "Set up testing framework"
description: "Configure from scratch"
- label: "TDD for new feature"
description: "Write tests first"
- label: "Fix flaky tests"
description: "Stabilize test suite"
- label: "Improve coverage"
description: "Find and fill gaps"
Q2: Test Level
question: "What level of testing?"
header: "Level"
multiSelect: true
options:
- label: "Unit tests"
description: "Test individual functions/classes"
- label: "Integration tests"
description: "Test components together"
- label: "E2E tests"
description: "Test full user flows"
- label: "API tests"
description: "Test HTTP endpoints"
Routing:
- "Unit" → unit-testing, mocking-strategies
- "Integration" → integration-testing, test containers
- "E2E" → e2e-testing, Playwright/Cypress
- "API" → api-testing, contract testing
Q3: Test Framework (if not detected)
question: "Which test framework?"
header: "Framework"
multiSelect: false
options:
- label: "pytest (Python)"
description: "Python testing framework"
- label: "Jest (JavaScript)"
description: "JavaScript testing"
- label: "Vitest (JavaScript)"
description: "Fast Vite-native testing"
- label: "Go testing"
description: "Built-in Go testing"
- label: "Playwright (E2E)"
description: "Cross-browser E2E"
Q4: Mocking Needs
question: "What do you need to mock?"
header: "Mocking"
multiSelect: true
options:
- label: "External APIs"
description: "HTTP calls to third parties"
- label: "Database"
description: "DB queries and transactions"
- label: "Time/dates"
description: "Freeze time for tests"
- label: "File system"
description: "File operations"
- label: "Nothing / minimal mocking"
description: "Prefer real dependencies"
When to Use
- Unit testing strategies
- Integration testing
- End-to-end (E2E) testing
- Test-driven development (TDD)
- Mocking and stubbing
- Test fixtures and factories
- Security testing
- Code coverage analysis
- Language-specific testing (pytest, Jest, Go testing, etc.)
Methodologies
| Category | Methodology | File |
|---|---|---|
| Testing Levels | ||
| Unit testing | Unit test patterns, isolation, assertions | unit-testing.md |
| Integration testing | Integration test patterns, test containers | integration-testing.md |
| E2E testing basics | End-to-end test patterns | e2e-testing.md |
| E2E testing alt | E2E strategies | testing-e2e.md |
| Testing Practices | ||
| TDD workflow | Red-green-refactor, TDD cycle | tdd-workflow.md |
| Mocking strategies | Mocks, stubs, spies, fakes | mocking-strategies.md |
| Test fixtures | Fixture patterns, factory pattern | test-fixtures.md |
| Testing patterns | General testing patterns | testing-patterns.md |
| Security | ||
| Security testing | SAST, DAST, penetration testing | security-testing.md |
| Language-Specific | ||
| pytest testing | pytest fixtures, parametrize, markers | testing-pytest.md |
| JavaScript testing | Jest, Vitest, React Testing Library | testing-javascript.md |
| Go testing | Go testing stdlib, table tests | testing-go.md |
Tools by Language
Python: pytest, unittest, hypothesis, factory-boy, faker JavaScript: Jest, Vitest, Mocha, Chai, React Testing Library, Cypress, Playwright Go: testing stdlib, testify, gomock Java: JUnit 5, Mockito, AssertJ C#: xUnit, NUnit, Moq, FluentAssertions
E2E: Playwright, Cypress, Selenium, Puppeteer Security: OWASP ZAP, Burp Suite, Snyk, SonarQube
Related Sub-Skills
| Sub-skill | Relationship |
|---|---|
| faion-python-developer | pytest, Django testing |
| faion-javascript-developer | Jest, Vitest testing |
| faion-backend-developer | Language-specific testing |
| faion-api-developer | API testing, contract testing |
| faion-devtools-developer | Code coverage, test automation |
Integration
Invoked by parent skill faion-software-developer for testing-related work.
faion-testing-developer v1.0 | 12 methodologies