Added basic test for signal sum.
Added basic test for signal sum.

Aldor007/aquila,zsiciarz/aquila,synkarae/Quasar,synkarae/aquila,sav6622/aquila,sav6622/aquila,synkarae/Quasar,zsiciarz/aquila,synkarae/Quasar,tempbottle/aquila,sav6622/aquila,tempbottle/aquila,synkarae/aquila,zsiciarz/aquila,Aldor007/aquila,tempbottle/aquila,Aldor007/aquila,synkarae/aquila,zsiciarz/aquila