Testing
Firebase Cloud Messaging (FCM) is the backbone of push notifications for Android, iOS, and web apps, but testing it without hitting real devices is a challenge most teams skip. This guide shows how to write reliable unit tests for FCM payloads, multicast sends, and topic subscriptions using unittest.mock in
Database
Testing Firestore well means combining the Firebase Emulator for integration tests, @firebase/rules-unit-testing for security rule validation, and carefully structured async tests for real-time listeners — all without touching production Firestore. Key Takeaways Security rules are code — test them like code. Every path in your firestore.rules file
Testing
Firebase Functions testing uses two approaches: unit tests with mocked Firebase SDKs (fast, no infrastructure), and integration tests with the Firebase Emulator Suite (accurate, uses real Firestore, Auth, and Storage emulators locally). The Firebase Test SDK (@firebase/rules-unit-testing) simplifies emulator interaction in tests. Key Takeaways The Firebase Emulator