* Sprinkle "pragma: no cover" comments in places where we do not expect the test suite to cover, e.g. asserts, non-test-paths, "virtual" methods, reprs.
* Add a few tests for legitimately missed sections.
Remove testing infrastructure from the foreground process. Now we only need specific programmatic coverage invocation in the D-Bus activated subprocess. For the foreground process, invoke the test suite using the python3-coverage script via the tox.ini file.