tree e8f7a9f3bdcc762e2766f39b997a6cd2c7aa2ea1
parent 82368b1bad1eae400b9e1f8f0e7a452c1335d4db
author Patrick Steinhardt <ps@pks.im> 1495190748 +0200
committer Patrick Steinhardt <ps@pks.im> 1496734724 +0200

tests: index::version: verify we write compressed index entries

While we do have a test which checks whether a written index of version
4 has the correct version set, we do not check whether this actually
enables path compression for index entries. This commit adds a new test
by adding a number of index entries with equal path prefixes to the
index and subsequently flushing that to disk. With suffix compression
enabled by index version 4, only the last few bytes of these paths will
actually have to be written to the index, saving a lot of disk space.
For the test, differences are about an order of magnitude, allowing us
to easily verify without taking a deeper look at actual on-disk
contents.