Fix tests for Instance.__repr__ and __str__
Fix tests for Instance.__repr__ and __str__

qusp/orange3,marinkaz/orange3,qPCR4vir/orange3,kwikadi/orange3,marinkaz/orange3,marinkaz/orange3,qPCR4vir/orange3,marinkaz/orange3,cheral/orange3,qPCR4vir/orange3,cheral/orange3,qPCR4vir/orange3,cheral/orange3,cheral/orange3,cheral/orange3,kwikadi/orange3,kwikadi/orange3,qusp/orange3,qusp/orange3,marinkaz/orange3,kwikadi/orange3,kwikadi/orange3,marinkaz/orange3,qusp/orange3,qPCR4vir/orange3,kwikadi/orange3,cheral/orange3,qPCR4vir/orange3