[test] added minimal db seed for extensions tests
Merge pull request #9 from tkrille/OSNG-189

Osng 189
Merge pull request #10 from tkrille/db_seed_for_extensions_tests

Db seed for extensions tests
[fix] Make sure the database is properly emptied before running tests
[enhancement] Testfixture to include expected (not in use yet)
Added test and fixture for update