public BluetoothGattDescriptor getDescriptor(UUID uuid) {
        for (BluetoothGattDescriptor descriptor : mDescriptors) {
            if (descriptor.getUuid().equals(uuid)) {
                return descriptor;
            }
        }
        return null;
    }
Used for mocks and constants in rxandroidble, but instances created in mockrxandroidble, so the methods must be implemented
rxandroidble/src/test/java/android/bluetooth/BluetoothGattCharacteristic.java