perl-Workflow-1.41-2.fc22 fails to build randomly in F22. 'One observation sent on workflow fetch to two observers' t/workflow.t test sometimes fails:

t/validator_matches_date_format.t .. ok
#   Failed test 'One observation sent on workflow fetch to two observers'
#   at t/workflow.t line 80.
#          got: '4'
#     expected: '2'
# Looks like you failed 1 test of 37.
t/workflow.t .......................
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/37 subtests

First, I thought this was caused by upgrading perl-DateTime (from 1.10) and perl-DateTime-TimeZone. But the random failure occurs even with these old versions. So I conclude this is race in the test or in some of used modules.

It's reproducible with command:

Workflow-1.41$ (prove -b -v t/workflow.t); do :;done