improved api tests to use a fixture SourceAdapter, we can ref it in docs
improved api tests to use a fixture SourceAdapter, we can ref it in docs

dfeyer/api2go,greyhwndz/api2go,greyhwndz/api2go,dfeyer/api2go,dennisfaust/api2go,dennisfaust/api2go,theduke/api2go,interlock/api2go,manyminds/api2go,theduke/api2go,manyminds/api2go,interlock/api2go