Dear list, I can't find the exact message where this issue was raised, but it would be useful to check if the generated ePub files are valid. Most of the process relies on external dependencies, so I don't think it's really useful to test if several XSLT processors give the same output. However, it might be useful to check if the generated ePub files are valid according to the spec: it could also highlight errors in the dependencies.
As far as I know, the most-used validator for ePub is ePubCheck ( https://github.com/w3c/epubcheck), a Java-based application (yes, even more Java >_<). There is also FlightCrew ( https://github.com/Sigil-Ebook/flightcrew), a plug-in for an ePub editor, I don't know if it's useable outside the Sigil editor (but it's only C++, so that's not a new hard dependency for running tests). In any case, deploying ePubCheck seems to be easier than FlightCrew (just download a load of JAR files from https://mvnrepository.com/artifact/org.w3c/epubcheck/4.2.4). Is there any interest in making this part of the LyX test suite? How should test-only dependencies be handled?
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