[Test Failed] ICD unit test TestICDStateObserverOnTransitionToIdleModeEqualActiveModeDuration failure

[jmartinez-silabs]

Test issue(s)

The test TestICDStateObserverOnTransitionToIdleModeEqualActiveModeDuration fails at this check
https://github.com/project-chip/connectedhomeip/blob/master/src/app/icd/server/tests/TestICDManager.cpp#L1091
on systems using freeRTOS-based system layer timers.

The current assumption of the test is that the OnTransitionToIdle callback isn't called directly if timer is started with a timeout value of 0 here. The test then expects 1 extra event loop for the callback to be executed.

That seems to be true with the POSIX system layer timer implementation but not on the freeRTOS-based one, where the call back is instead called instantly.

This leads to different test results on other platforms.

Platform

freeRTOS

Anything else?

No response