The Firebase Emulators make it easier to fully validate your app's behavior and verify your Firebase Security Rules configurations. Use the Firebase Emulators to run and automate unit tests in a local environment.
Install the Firebase Emulators
Before you begin make sure you have installed the Firebase CLI and configured the Firebase Local Emulator Suite
Start the emulator using the following command. The emulator runs during all your tests.
firebase emulators:start --only firestore
firebase emulators:start --only database
firebase emulators:start --only storage
Set up tests and run the emulator
Now that you've installed the emulator, set up tests and generate reports to validate your rules' behavior before you deploy them to production.
For a few basic test cases with simple rules, try out the testing quickstart.