tests: Check that unknown metas are filled properly in extend/append
tests: Check that unknown metas are filled properly in extend/append

kwikadi/orange3,qPCR4vir/orange3,kwikadi/orange3,qPCR4vir/orange3,cheral/orange3,qPCR4vir/orange3,cheral/orange3,cheral/orange3,cheral/orange3,qPCR4vir/orange3,qPCR4vir/orange3,kwikadi/orange3,qPCR4vir/orange3,cheral/orange3,kwikadi/orange3,cheral/orange3,kwikadi/orange3,kwikadi/orange3