Added test for methods returning by reference
Added test for methods returning by reference

padraic/mockery,yeka/mockery,kminh/mockery,tfrommen/mockery,TiagoMaiaL/mockery,jenswiese/mockery,fhinkel/mockery,tfrommen/mockery,kminh/mockery,Big-Shark/mockery,Big-Shark/mockery,florianeckerstorfer/mockery,jenswiese/mockery,TiagoMaiaL/mockery,5outh/mockery,florianeckerstorfer/mockery,5outh/mockery,majisti/mockery,fhinkel/mockery,yeka/mockery