# Designing Tests

Designs and implements testing strategies for any codebase.

- Repository: https://github.com/CloudAI-X/claude-workflow-v2 (1421 stars)
- Category: Design
- License: MIT
- Last updated: 2026-10-06
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add CloudAI-X/claude-workflow-v2 --skill designing-tests -g -a claude-code -y`
Codex: `npx skills add CloudAI-X/claude-workflow-v2 --skill designing-tests -g -a codex -y`
Cursor: `npx skills add CloudAI-X/claude-workflow-v2 --skill designing-tests -g -a cursor -y`
Gemini CLI: `npx skills add CloudAI-X/claude-workflow-v2 --skill designing-tests -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add CloudAI-X/claude-workflow-v2`

## Description

Designs and implements testing strategies for any codebase. Use when adding tests, improving coverage, setting up testing infrastructure, debugging test failures, or when asked about unit tests, integration tests, or E2E testing.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Designing Tests

### When to Load

- **Trigger**: Adding tests, test strategy planning, improving coverage, setting up testing infrastructure
- **Skip**: Non-test code changes where testing is not part of the task

## Test Implementation Workflow

Copy this checklist and track progress:

```
Test Implementation Progress:
- [ ] Step 1: Identify what to test
- [ ] Step 2: Select appropriate test type
- [ ] Step 3: Write tests following templates
- [ ] Step 4: Run tests and verify passing
- [ ] Step 5: Check coverage meets targets
- [ ] Step 6: Fix any failing tests
```

## Testing Pyramid

Apply the testing pyramid for balanced coverage:

```
        /\
       /  \     E2E Tests (10%)
      /----\    - Critical user journeys
     /      \   - Slow but comprehensive
    /--------\  Integration Tests (20%)
   /          \ - Component interactions
  /------------\ - API contracts
 /              \ Unit Tests (70%)
/________________\ - Fast, isolated
                   - Business logic focus
```

## Framework Selection

### JavaScript/TypeScript

| Type        | Recommended     | Alternative         |
| ----------- | --------------- | ------------------- |
| Unit        | Vitest          | Jest                |
| Integration | Vitest + MSW    | Jest + SuperTest    |
| E2E         | Playwright      | Cypress             |
| Component   | Testing Library | Vitest Browser Mode |

### Python

| Type        | Recommended                 | Alternative       |
| ----------- | --------------------------- | ----------------- |
| Unit        | pytest                      | unittest          |
| Integration | pytest + httpx              | pytest + requests |
| E2E         | Playwright                  | Selenium          |
| API         | pytest + FastAPI TestClient | -                 |

### Go

| Type        | Recommended        |
| ----------- | ------------------ |
| Unit        | testing + testify  |
| Integration | testing + httptest |
| E2E         | testing + chromedp |

The rest: https://github.com/CloudAI-X/claude-workflow-v2/blob/HEAD/skills/designing-tests/SKILL.md