Add a db test to increase db.py code coverage to 100%
Add a db test to increase db.py code coverage to 100%

Signed-off-by: Juerg Haefliger <71fc62073a74bb0183c934981fc15cc10b5a6493@hp.com>

dtroyer/dwarf,juergh/dwarf,dtroyer/dwarf,juergh/dwarf