A test is missing for receive messages in sleep mode.
To archive this, the test needs to send device to sleep

manual task

Go to Settings
Go to Developer options
Un-check Stay awake (3rd option from the top)

The emulator will go to sleep after 1 min (default setting) if not changed.

Press the power button to wake up the emulator.

command line

To put the device to sleep using command line, run: adb shell input keyevent 223

To wake the device from sleep using command line, run: adb shell input keyevent 224

For more info about key events you can send with ADB, check out the KEYCODE_... constants for KeyEvent,