The tests are forked from the chore tests with slight adaptations for
being run against the ranged loop. I also moved a benchmark for the
database from chore_test.go to db_test.go.
The pathcollector is reused as a rangedloop.Partial.
https://github.com/storj/storj/issues/5234
Change-Id: I56182031d133812a9f4d4a433c01b9150af39f31
