Currently all our continuous integration is done with free services linked into the GitHub ecosystem. There are linked badges on our main repository’s README page:
These automated tests in turn collect test coverage which is reported on another separate free service linked into the GitHub ecosystem:
Historically Biopython used to run a Buildbot server hosted on an Open Bioinformatics Foundation server which displayed the results of nightly test jobs submitted to a range of volunteer worker machines, including Linux, Windows and Mac OS machines.