TESTS: added basic 'AT tests to series-test.red
TESTS: added basic 'AT tests to series-test.red

iArnold/red,NikolayShubenkovProgSchool/red,red-eco/red,vehar/red,iArnold/red,rheber/red,red-eco/red,rheber/red,vehar/red,NikolayShubenkovProgSchool/red