This looks really good:

• 🚀 Fetch & XHR Support
• ⚡️️ Simple, Powerful, & Intuitive API
• 💎 First Class Mocha & QUnit Test Helpers
• 🔥 Intercept, Pass-Through, and Attach Events
• 📼 Record to Disk or Local Storage
• ⏱ Slow Down or Speed Up Time