See this link for the failure: https://jenkins.freebsd.org/job/FreeBSD_HEAD-tests2/733/testReport/junit/usr.sbin.pw/pw_useradd/user_add_password_expiration_date_relative/
Yeah... the clock ticked and the compared value was off by a second.
Frequency: https://jenkins.freebsd.org/job/FreeBSD_HEAD-tests2/743/testReport/junit/usr.sbin.pw/pw_useradd/user_add_account_expiration_date_relative/
Thanks for opening the PR. I'll take a look.
A commit references this bug: Author: brd Date: Tue Feb 24 22:22:07 UTC 2015 New revision: 279256 URL: https://svnweb.freebsd.org/changeset/base/279256 Log: Fix a race condition by allowing up to 5 seconds of difference between the time stamps. PR: 197861 Approved by: will Changes: head/usr.sbin/pw/tests/pw_useradd.sh