From E-Mail discussion:
"We could override the relevant test functions to skip the test if run on a
client setup. That detection could be implemented by defining a constant in
WikibaseClient.php (and a different constant in Wikibase.php). E.g. WB_CLIENT
and WB_REPO, or some such."
"Alternatively, split off the write tests from the read tests, and put the write
test into the repo extension. ORMRowTest could take a flag in the constructor,
telling it whether write operations should be tested."