This test uses the Mock Piconet Server to start both A2DP Sink and Source profiles in a fake piconet, where they connect to each other and stream audio in an endless loop using the real system audio services. This test should only be run in environments with real hardware.
Include --with //src/connectivity/bluetooth/profiles/tests in your fx set.
To run:
fx test -vo bt-a2dp-loopback-test