The design of the sql and kv db are a bit different. A harness
interface is introduced which allows us to unit most of the test
and keep the backend specific tests at a minimum.
In commit adds the harness which will be used to run db agnostic
tests against the kv and sql backend. We have adopted all the
unit tests so far so that with this commit all the payment tests
not specifically put into the kv_store_test.go should all pass
for all backends.
This commit starts reusing test cases which are not dependant on
the kv db backend. So they can be later used with the native db
implementation as well.
This commit moves most of the code into its own package. It is
the smallest code move possible without moving import cycles and
keeping the changes to the code base as small as possible during
refactor.
ziggie