# Webapp Testing

> Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

- Skill: `edorabma9304/webapp-testing` (Agent Skill)
- Install (CLI): `npx skillmds@latest add edorabma9304/webapp-testing`
- Raw SKILL.md: https://api.skillmd.com/api/skills/edorabma9304/webapp-testing/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: edorabma9304 (https://skillmd.com/u/edorabma9304)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/edorabma9304/webapp-testing

---


# Web Application Testing

To test local web applications, write native Python Playwright scripts.

## Decision Tree: Choosing Your Approach

```
User task → Is it static HTML?
    ├─ Yes → Read HTML file directly to identify selectors
    │         ├─ Success → Write Playwright script using selectors
    │         └─ Fails/Incomplete → Treat as dynamic (below)
    │
    └─ No (dynamic webapp) → Is the server already running?
        ├─ No → Start server first, then write Playwright script
        │
        └─ Yes → Reconnaissance-then-action:
            1. Navigate and wait for networkidle
            2. Take screenshot or inspect DOM
            3. Identify selectors from rendered state
            4. Execute actions with discovered selectors
```

## Example: Start Server + Test

```bash
# Start dev server then run test
npm run dev &
sleep 3
python your_automation.py
```

## Playwright Script Pattern

```python
from playwright.sync_api import sync_playwright

with sync_playwright() as p:
    browser = p.chromium.launch(headless=True)
    page = browser.new_page()
    page.goto('http://localhost:5173')
    page.wait_for_load_state('networkidle')  # CRITICAL: Wait for JS

    # Screenshot for inspection
    page.screenshot(path='/tmp/inspect.png', full_page=True)

    # Find and interact with elements
    page.locator('button:has-text("Masuk")').click()
    page.wait_for_selector('.dashboard')

    # Verify content
    assert page.locator('h1').text_content() == 'Dashboard'

    browser.close()
```

## Reconnaissance-Then-Action Pattern

1. **Inspect rendered DOM**:
   ```python
   page.screenshot(path='/tmp/inspect.png', full_page=True)
   content = page.content()
   page.locator('button').all()
   ```

2. **Identify selectors** from inspection results

3. **Execute actions** using discovered selectors

## Common Pitfall

- **Don't** inspect the DOM before waiting for `networkidle` on dynamic apps
- **Do** wait for `page.wait_for_load_state('networkidle')` before inspection

## Best Practices

- Use `sync_playwright()` for synchronous scripts
- Always close the browser when done
- Use descriptive selectors: `text=`, `role=`, CSS selectors, or IDs
- Add appropriate waits: `page.wait_for_selector()` or `page.wait_for_timeout()`