[helpers] Adds tests for is_object and is_collection methods
[helpers] Adds tests for is_object and is_collection methods

bholzer/rabl,nesquena/rabl,Jyaasa/rabl,infertux/rabl,Jyaasa/rabl,zoyi/rabl,nesquena/rabl,bholzer/rabl,infertux/rabl,bholzer/rabl,Jyaasa/rabl,sideci-sample/sideci-sample-rabl,zoyi/rabl,infertux/rabl,sideci-sample/sideci-sample-rabl,zoyi/rabl,nesquena/rabl