TESTS: added tests of using string and char values as a path to series - issue #939
TESTS: added tests of using string and char values as a path to series - issue #939

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