The coverage of irclog2html dropped from 100% to 98% after a cron-triggered Travis CI rebuild with no code changes. I investigated and discovered that despite my .coveragerc containing
[run] source = irclog2html omit = */tests/*,*/xchatlogsplit.py
the new version of coverage (4.5) does not omit src/irclog2html/tests/test_*.py from measurement or reporting.
This is probably related to commit 1031ead7ca4c.