@joeha480 noted that regression test are a good complement to unit tests. They can possibly cover more or other things than unit tests because they are based on real life use cases. Also, they represent what someone finds the most important about a program or library. For instance, MTM has a bunch of regression tests for Dotify, but it doesn't cover all the features available in Dotify because MTM doesn't use all of those features.
It would be good to have:
regression tests for the system as a whole (DTBook to PEF or EPUB3 to PEF)
regression tests for Dotify from other agencies (unclear how this could be done, OBFL to PEF tests are problematic, e.g. because the OBFL-to-PEF conversion that happens in the Pipeline depends on custom translators)
@joeha480 noted that regression test are a good complement to unit tests. They can possibly cover more or other things than unit tests because they are based on real life use cases. Also, they represent what someone finds the most important about a program or library. For instance, MTM has a bunch of regression tests for Dotify, but it doesn't cover all the features available in Dotify because MTM doesn't use all of those features.
It would be good to have: