How do I install the Webapp Testing skill?

Run npx skillmds@latest add darthlinuxer/webapp-testing in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Webapp Testing skill do?

Web application testing principles. E2E, Playwright, deep audit strategies. It is listed under Security on SkillMD.

Is Webapp Testing safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Webapp Testing?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Webapp Testing free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Webapp Testing?

darthlinuxer (@darthlinuxer) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Webapp Testing by darthlinuxer — Agent Skill

Name: Webapp Testing
Author: darthlinuxer

File contents

Web App Testing

Discover and test everything. Leave no route untested.

🔧 Runtime Scripts

Execute these for automated browser testing:

Script	Purpose	Usage
`scripts/playwright_runner.py`	Basic browser test	`python scripts/playwright_runner.py
	With screenshot	`python scripts/playwright_runner.py <url> --screenshot`
	Accessibility check	`python scripts/playwright_runner.py <url> --a11y`

Requires: pip install playwright && playwright install chromium

1. Deep Audit Approach

Discovery First

Target	How to Find
Routes	Scan app/, pages/, router files
API endpoints	Grep for HTTP methods
Components	Find component directories
Features	Read documentation

Systematic Testing

Map - List all routes/APIs
Scan - Verify they respond
Test - Cover critical paths

2. Testing Pyramid for Web

        /\          E2E (Few)
       /  \         Critical user flows
      /----\
     /      \       Integration (Some)
    /--------\      API, data flow
   /          \
  /------------\    Component (Many)
                    Individual UI pieces

3. E2E Test Principles

What to Test

Priority	Tests
1	Happy path user flows
2	Authentication flows
3	Critical business actions
4	Error handling

E2E Best Practices

Practice	Why
Use data-testid	Stable selectors
Wait for elements	Avoid flaky tests
Clean state	Independent tests
Avoid implementation details	Test user behavior

4. Playwright Principles

Core Concepts

Concept	Use
Page Object Model	Encapsulate page logic
Fixtures	Reusable test setup
Assertions	Built-in auto-wait
Trace Viewer	Debug failures

Configuration

Setting	Recommendation
Retries	2 on CI
Trace	on-first-retry
Screenshots	on-failure
Video	retain-on-failure

5. Visual Testing

When to Use

Scenario	Value
Design system	High
Marketing pages	High
Component library	Medium
Dynamic content	Lower

Strategy

Baseline screenshots
Compare on changes
Review visual diffs
Update intentional changes

6. API Testing Principles

Coverage Areas

Area	Tests
Status codes	200, 400, 404, 500
Response shape	Matches schema
Error messages	User-friendly
Edge cases	Empty, large, special chars

7. Test Organization

File Structure

tests/
├── e2e/           # Full user flows
├── integration/   # API, data
├── component/     # UI units
└── fixtures/      # Shared data

Naming Convention

Pattern	Example
Feature-based	`login.spec.ts`
Descriptive	`user-can-checkout.spec.ts`

8. CI Integration

Pipeline Steps

Install dependencies
Install browsers
Run tests
Upload artifacts (traces, screenshots)

Parallelization

Strategy	Use
Per file	Playwright default
Sharding	Large suites
Workers	Multiple browsers

9. Anti-Patterns

❌ Don't	✅ Do
Test implementation	Test behavior
Hardcode waits	Use auto-wait
Skip cleanup	Isolate tests
Ignore flaky tests	Fix root cause

Remember: E2E tests are expensive. Use them for critical paths only.

---name: webapp-testingdescription: Web application testing principles. E2E, Playwright, deep audit strategies.---# Web App Testing> Discover and test everything. Leave no route untested.## 🔧 Runtime Scripts**Execute these for automated browser testing:**| Script | Purpose | Usage ||--------|---------|-------|| `scripts/playwright_runner.py` | Basic browser test | `python scripts/playwright_runner.py || | With screenshot | `python scripts/playwright_runner.py <url> --screenshot` || | Accessibility check | `python scripts/playwright_runner.py <url> --a11y` |**Requires:** `pip install playwright && playwright install chromium`---## 1. Deep Audit Approach### Discovery First| Target | How to Find ||--------|-------------|| Routes | Scan app/, pages/, router files || API endpoints | Grep for HTTP methods || Components | Find component directories || Features | Read documentation |### Systematic Testing1. **Map** - List all routes/APIs2. **Scan** - Verify they respond3. **Test** - Cover critical paths---## 2. Testing Pyramid for Web``` /\ E2E (Few) / \ Critical user flows /----\ / \ Integration (Some) /--------\ API, data flow / \ /------------\ Component (Many) Individual UI pieces```---## 3. E2E Test Principles### What to Test| Priority | Tests ||----------|-------|| 1 | Happy path user flows || 2 | Authentication flows || 3 | Critical business actions || 4 | Error handling |### E2E Best Practices| Practice | Why ||----------|-----|| Use data-testid | Stable selectors || Wait for elements | Avoid flaky tests || Clean state | Independent tests || Avoid implementation details | Test user behavior |---## 4. Playwright Principles### Core Concepts| Concept | Use ||---------|-----|| Page Object Model | Encapsulate page logic || Fixtures | Reusable test setup || Assertions | Built-in auto-wait || Trace Viewer | Debug failures |### Configuration| Setting | Recommendation ||---------|----------------|| Retries | 2 on CI || Trace | on-first-retry || Screenshots | on-failure || Video | retain-on-failure |---## 5. Visual Testing### When to Use| Scenario | Value ||----------|-------|| Design system | High || Marketing pages | High || Component library | Medium || Dynamic content | Lower |### Strategy- Baseline screenshots- Compare on changes- Review visual diffs- Update intentional changes---## 6. API Testing Principles### Coverage Areas| Area | Tests ||------|-------|| Status codes | 200, 400, 404, 500 || Response shape | Matches schema || Error messages | User-friendly || Edge cases | Empty, large, special chars |---## 7. Test Organization### File Structure```tests/├── e2e/ # Full user flows├── integration/ # API, data├── component/ # UI units└── fixtures/ # Shared data```### Naming Convention| Pattern | Example ||---------|---------|| Feature-based | `login.spec.ts` || Descriptive | `user-can-checkout.spec.ts` |---## 8. CI Integration### Pipeline Steps1. Install dependencies2. Install browsers3. Run tests4. Upload artifacts (traces, screenshots)### Parallelization| Strategy | Use ||----------|-----|| Per file | Playwright default || Sharding | Large suites || Workers | Multiple browsers |---## 9. Anti-Patterns| ❌ Don't | ✅ Do ||----------|-------|| Test implementation | Test behavior || Hardcode waits | Use auto-wait || Skip cleanup | Isolate tests || Ignore flaky tests | Fix root cause |---> **Remember:** E2E tests are expensive. Use them for critical paths only.

Frequently asked questions

Webapp Testing