[test] Added test for router.attach
[test] Added test for router.attach

pocketjoso/director,webx32/director,kiritoe/director,sheldonzf/director,kiritoe/director,fadeit/director,vitalsource/director,stonegithubs/director,vitalsource/director,tanzhihang/director,tanzhihang/director,meleslilijing/director,pandoraui/director,webx32/director,andradedev/director,flatiron/director,GerHobbelt/director,mylikes/director,cpg1111/director,cpg1111/director,GerHobbelt/director,noxryan/director,pandoraui/director,mylikes/director,lzhengms/director,maxogden/director,lzhengms/director,meleslilijing/director,ks3dev/director,andradedev/director,stonegithubs/director,pocketjoso/director,ks3dev/director,fadeit/director,sheldonzf/director