How to Fake battery settings/status during a Flutter Integration Test?

Question

The (Android) app we're working on is depended on it's plugged-in (AC) status.

Because we want to run the app on a real device connected to our buildserver we need a way to fake this behaviour in order to fully test the app without actually removing the device from power.

Now I've learned about adb shell dumpsys battery ac 0|1 which allowed me to set it. But I was unable to get this working during the test itself with:

Process.run('adb', [
    'shell',
    'dumpsys',
    'battery',
    'set',
    'ac',
    '1',
  ]);

This results in the following error:

══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞═════════════════
The following ProcessException was thrown running a test:
Permission denied
  Command: adb shell dumpsys battery set ac 1

I also tried it with sudo, but that resulted in the same.