browser-testing-with-screenshots

Use when testing web applications with visual verification - automates Chrome browser interactions, element selection, and screenshot capture for confirming UI functionality

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name	browser-testing-with-screenshots
description	Use when testing web applications with visual verification - automates Chrome browser interactions, element selection, and screenshot capture for confirming UI functionality
metadata	{"author":"AgentWorkforce"}

Browser Testing with Screenshots

Overview

Automate Chrome browser testing with visual verification using browser-tools. Connect to Chrome DevTools Protocol for navigation, interaction, and screenshot capture to confirm application functionality.

Prerequisites

REQUIRED: Install agent-tools from https://github.com/badlogic/agent-tools

# Clone and install agent-tools
git clone https://github.com/badlogic/agent-tools.git
cd agent-tools
# Follow installation instructions in the repository
# Ensure all executables (browser-start.js, browser-nav.js, etc.) are in your PATH

Verify installation:

# Check that browser tools are available
which browser-start.js
which browser-nav.js
which browser-screenshot.js

All browser-* commands referenced in this skill come from the agent-tools repository and must be properly installed and accessible in your system PATH.

When to Use

Use this skill when:

Task	Command	Purpose
Start browser	`browser-start.js`	Launch Chrome with debugging
Navigate	`browser-nav.js http://localhost:5172/dashboard`	Go to specific URL
Take screenshot	`browser-screenshot.js`	Capture current viewport
Pick elements	`browser-pick.js "Select the login button"`	Interactive element selection
Run JavaScript	`browser-eval.js 'document.title'`	Execute code in page context
Extract content	`browser-content.js`	Get readable page content
View cookies	`browser-cookies.js`	List session cookies

# Launch Chrome with debugging enabled (preserves user profile)
browser-start.js

# Or start fresh (no cookies, clean state)
browser-start.js --fresh

# Go to your application starting point
browser-nav.js http://localhost:5172/dashboard

# Take initial screenshot to confirm page loaded
browser-screenshot.js

#!/bin/bash
# Test login and dashboard functionality

echo "🚀 Starting browser test..."

# 1. Launch browser
browser-start.js --fresh

# 2. Navigate to login page
browser-nav.js http://localhost:5172/login
sleep 2

# 3. Take screenshot of login page
LOGIN_SHOT=$(browser-screenshot.js)
echo "📸 Login page: $LOGIN_SHOT"

# 4. Fill login form (interactive element picking)
browser-pick.js "Click the username field"
browser-eval.js 'document.activeElement.value = "testuser"'

browser-pick.js "Click the password field"
browser-eval.js 'document.activeElement.value = "password123"'

# 5. Screenshot filled form
FORM_SHOT=$(browser-screenshot.js)
echo "📸 Filled form: $FORM_SHOT"

# 6. Submit form
browser-pick.js "Click the login button"
sleep 3

# 7. Verify dashboard loaded
browser-nav.js http://localhost:5172/dashboard
DASHBOARD_SHOT=$(browser-screenshot.js)
echo "📸 Dashboard: $DASHBOARD_SHOT"

# 8. Verify specific dashboard elements
browser-pick.js "Select the navigation menu"
browser-eval.js 'console.log("Navigation found:", !!document.querySelector(".nav"))'

echo "✅ Test complete. Screenshots saved."

# Interactive element selection (best for dynamic content)
browser-pick.js "Select the submit button"
# User clicks element in browser → returns CSS selector

# Use returned selector for automation
SELECTOR=$(browser-pick.js "Select the submit button" | grep "selector:")
browser-eval.js "document.querySelector('$SELECTOR').click()"

# Take screenshot to verify action
browser-screenshot.js

# Check if element exists before interaction
browser-eval.js 'document.querySelector("#login-form") !== null'

# Wait for dynamic content
browser-eval.js '
  new Promise(resolve => {
    const check = () => {
      if (document.querySelector(".loaded")) resolve(true);
      else setTimeout(check, 100);
    };
    check();
  })
'

# Extract form data
browser-eval.js 'JSON.stringify(Object.fromEntries(new FormData(document.querySelector("form"))))'

# Navigate and wait before screenshot
browser-nav.js http://localhost:5172/slow-page
sleep 5  # Wait for animations/loading
browser-screenshot.js

# Get page title
PAGE_TITLE=$(browser-eval.js 'document.title')
echo "Current page: $PAGE_TITLE"

# Extract readable content
browser-content.js > page_content.md

# Check for specific text
browser-eval.js 'document.body.textContent.includes("Welcome to Dashboard")'

Mistake	Problem	Solution
No sleep after navigation	Screenshots of loading page	Add `sleep 2-5` after nav
Hardcoded selectors	Breaks when UI changes	Use `browser-pick.js` for selection
Missing Chrome setup	"Connection refused" errors	Run `browser-start.js` first
Wrong localhost port	Navigation fails	Verify application is running on correct port
Screenshot timing	Captures before content loads	Wait for page load or specific elements
Not preserving state	Login lost between commands	Use default profile, not `--fresh`

# Check if Chrome is running
if ! browser-eval.js 'true' 2>/dev/null; then
  echo "❌ Chrome not connected. Running browser-start.js..."
  browser-start.js
fi

# Verify navigation succeeded
if browser-eval.js 'location.href.includes("dashboard")'; then
  echo "✅ Navigation successful"
else
  echo "❌ Navigation failed"
  exit 1
fi

# Create test evidence directory
mkdir -p test-results/$(date +%Y%m%d_%H%M%S)
cd test-results/$(date +%Y%m%d_%H%M%S)

# Run tests with organized screenshots
browser-start.js
for page in login dashboard profile; do
  browser-nav.js "http://localhost:5172/$page"
  sleep 2
  screenshot=$(browser-screenshot.js)
  mv "$screenshot" "${page}_page.png"
  echo "✅ $page page tested"
done