This makes sure that length and hash are calculated if not known.
This patch also adds missing unit tests for RevisionArchiveRecord,
and consolidates unit tests for the different RevisionRecord
subclasses using a trait.
Bug: T192189
Change-Id: I5e1d17ba96e61e068b6aa5ac9c45ac0f657905a6
The field names used in SlotRecord got out of sync with the changes made
to the database schema. Nobody noticed, because these fields are not yet
written to or read from the database.
This change also rewrites SlotRecordTest and adds several sanity checks
to SlotRecord, in preparation of the introduction of slot_origin.
Change-Id: Ifdf040174705bf88104b8c922c9d6d1120d48f3a
