The app asks for a permission only when you open the test that needs it. You can skip any test.
Camera
Used only in the camera test to show a live preview. Nothing is recorded or saved.
Microphone
Used only in the microphone test to show a live level. Nothing is recorded or saved.
Location and Bluetooth scan
Used only in the wireless test. Android needs location access to list nearby Wi-Fi networks, Bluetooth devices and GPS. Results are shown on screen and are not stored or sent anywhere.
Fingerprint and face
The app does not read your fingerprint or face data. It only checks whether the sensor is ready.