Introduction
This test application underflows ztimer clocks by setting a time offset of zero. The tests succeeds if the board running the test does not get stuck.
ZTIMER_USEC
Set the environment variable TEST_ZTIMER_CLOCK=ZTIMER_USEC. If the test gets
stuck, increase CONFIG_ZTIMER_USEC_MIN.
ZTIMER_MSEC
Set the environment variable TEST_ZTIMER_CLOCK=ZTIMER_MSEC. If the test gets
stuck, increase RTT_MIN_OFFSET.