unit tests are not written to always succeed in GAE dev environment

[mitchellsundt]

Migrated to getodk/aggregate#38 by spacetelescope/github-issues-import

Originally reported on Google Code with ID 745

Many of the unit tests of the persistence layer assume if you put() a value, then an
immediate get() will retrieve it. This is not true in the parallel datastore dev environment.


And production code shouldn't be doing immediate fetches anyways.

Need to look into how to correctly flush GAE datastore during unit tests so these random
errors don't occur.

Reported by mitchellsundt on 2013-01-17 02:52:09