Occasional test failures of test_hw_tx_timer_wrap[socket] using random timings in tests

[humphrey-xmos]

Occational flaky failures of ...

FAILED test_hw_tx_timer_wrap.py::test_hw_tx_timer_wrap[socket] - AssertionError: DUT inter packet delay later than expected. Delay between received packets 40.0382, Expected delay 39.0000

Rerunning job often passes...mmm.

Firslty, AssertionError: DUT inter packet delay later than expected. Delay between received packets 28.0474, Expected delay 27.0000, the test is checking that the response it received within 1 second of the expected time. Failures seem to be because the time is taking just over 1 second.

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There is a question about whether random timing should be used in PR testing, but only nightly and weekend tests instead.

lib_ethernet/tests/test_hw_tx_timer_wrap.py

Line 45 in 7d06795

This test introduces a large delay (rand.randint(20, 40) seconds) between requesting the device to transmit a

This is to keep the PR testing predictable and repeatable.