Since original Blazegraph developers are no longer actively maintaining Blazegraph, we may need to take more active role in it. We already have a number of patches for Blazegraph in the version we use (wikidata/query/blazegraph gerrit repo) and we may have more. To properly test them, we need CI setup that is capable of running full Blazegraph test suite.
There are instruction for doing this at https://wiki.blazegraph.com/wiki/index.php/Contributors#Unit_tests but not sure how these are up-to-date.