Add javascript test for Channel.onClose
Add javascript test for Channel.onClose

ybur-yug/phoenix,pap/phoenix,iStefo/phoenix,trarbr/phoenix,jwarwick/phoenix,michalmuskala/phoenix,Kosmas/phoenix,Ben-Evolently/phoenix,bsmr-erlang/phoenix,phoenixframework/phoenix,eksperimental/phoenix,jamilabreu/phoenix,mschae/phoenix,Kosmas/phoenix,ericmj/phoenix,phoenixframework/phoenix,iStefo/phoenix,stevedomin/phoenix,trarbr/phoenix,evax/phoenix,cas27/phoenix,0x00evil/phoenix,optikfluffel/phoenix,0x00evil/phoenix,eksperimental/phoenix,rafbgarcia/phoenix,gjaldon/phoenix,korobkov/phoenix,mitchellhenke/phoenix,dmarkow/phoenix,gjaldon/phoenix,nshafer/phoenix,jwarwick/phoenix,Gazler/phoenix,Gazler/phoenix,mobileoverlord/phoenix,keathley/phoenix,Joe-noh/phoenix,optikfluffel/phoenix,evax/phoenix,ybur-yug/phoenix,rafbgarcia/phoenix,CultivateHQ/phoenix,michalmuskala/phoenix,cas27/phoenix,phoenixframework/phoenix,rafbgarcia/phoenix,Joe-noh/phoenix,nshafer/phoenix,optikfluffel/phoenix,keathley/phoenix,0x00evil/phoenix,nshafer/phoenix,bsmr-erlang/phoenix,CultivateHQ/phoenix,pap/phoenix,korobkov/phoenix,jamilabreu/phoenix,dmarkow/phoenix,ericmj/phoenix,mobileoverlord/phoenix,stevedomin/phoenix,mitchellhenke/phoenix,mschae/phoenix