These methods definitely need explicit test coverage:
[] getRevisionText - https://gerrit.wikimedia.org/r/#/c/391183/ (patch for review) & https://gerrit.wikimedia.org/r/#/c/391192 (patch for review)
[x] decompressRevisionText - https://gerrit.wikimedia.org/r/390399 (90%, just missing 1 warning)
[x] newKnownCurrent - https://gerrit.wikimedia.org/r/390412
Not quite as important, but should also be tested:
[x] userCan - https://gerrit.wikimedia.org/r/390425
[x] userCanBitfield - https://gerrit.wikimedia.org/r/390424
[] getRecentChange - https://gerrit.wikimedia.org/r/#/c/391194 (patch for review)
[] getQueryInfo
[] getArchiveQueryInfo
The following methods get tested only indirectly. This means that when they turn
into proxies for the new code, we don't know if they still do the right thing:
[] insertOn
[x] compressRevisionText - https://doc.wikimedia.org/cover/mediawiki-core/includes/Revision.php.html#1473 (already covered @ 80%, just missing 2 warnings)
[] newFromArchiveRow
[] newNullRevision
[] getContent
[] getComment
[] getUserText
[] getUser
[x] isUnpatrolled - https://gerrit.wikimedia.org/r/#/c/390405 (patch merged, 100% coverage)