Testing: improve error message for event test failures
This is one potential resolution to fix improving error messaging for the issue #495
(assuming that the occasional timeout, which only seems to happen on CI, is a CI platform/runtime issue and not a deeper issue in the event-system)
An alternative fix could simply be to increase DELAY_PER_RETRY
in test_event.py - but to what value?
Edited by Ulrik Pedersen