Initial commit - Rentall App

- Full-stack rental marketplace application
- React frontend with TypeScript
- Node.js/Express backend with JWT authentication
- Features: item listings, rental requests, calendar availability, user profiles

frontend/src/setupTests.ts

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';