`test_battery_status.py::TestBatteryStatus::test_async_battery_status` is very slow

[llucax]

What happened?

The test test_battery_status.py::TestBatteryStatus::test_async_battery_status is very slow, it takes about 6 seconds to complete.

What did you expect instead?

The test to run fast.

Affected version(s)

No response

Affected part(s)

Unit, integration and performance tests (part:tests)

Extra information

The problem seems to be in the finalization of either the mock_microgrid or the BatteryStatusTracker, as most of the time is spent in leaving the async with block having those 2.

Time machine is used to speed up the time, but maybe async solipsism isn't and there is something awaiting for some time in the finalization.