Hi @simaki,
This is strange indeed! I dug into this a little bit but looking at the coverage reports uploaded https://codecov.io/gh/simaki/fracdiff/commit/a9670ae0783a114cb0334d0fbe2e89b9eb4c5c05/build
You’ll notice that build 98.3 is showing missed coverage for statfracdiff.py for some rogue lines.
Because this is coming from the coverage report, we assume that it’s accurate. The issue seems to be somewhere in the process before they get uploaded to Codecov.