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

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

Playwright Script Pattern

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:

   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()