tests: stop using old assert methods

3 jobs for fix/deprectated_test_methods
Status Job ID Name Coverage
  External
running SlapOS.Eggs.UnitTest-Jerome.Python2

38528:37:53

running SlapOS.Eggs.UnitTest-Master.Python2

38528:38:13

running SlapOS.Eggs.UnitTest-Master.Python3

38528:38:10