Use show instead of literals in Spec.hs asserts

Use show with database objects instead of string literals to make them
more maintainable as new tests are added.

Signed-off-by: Stian Ellingsen    <stian@plaimi.net>
Reviewed-by:   Alexander Berntsen <alexander@plaimi.net>
Signed-off-by: Alexander Berntsen <alexander@plaimi.net>