In this blog, we learn about how to test biometric authentication with Appium on a real device cloud like LambdaTest and also enabling biometrics in emulators and run the automation tests locally on it using Appium. The importance of testing biometric authentication is discussed along with its basic aspects such as functional and security validation, compatibility testing, checking multi-app interactions, and enhanced user experience. We explore where to test biometric authentication and how to test biometric authentication with Appium on real devices. Finally, we discuss the implementation of test scenarios for successful and failed fingerprint authentication using Appium on a real device cloud like LambdaTest.