some test cases for fopen of storage backends
some test cases for fopen of storage backends

pixelipo/server,whitekiba/server,jbicha/server,owncloud/core,jbicha/server,cernbox/core,andreas-p/nextcloud-server,pollopolea/core,andreas-p/nextcloud-server,lrytz/core,owncloud/core,nextcloud/server,pollopolea/core,pmattern/server,endsguy/server,sharidas/core,pmattern/server,Ardinis/server,jbicha/server,michaelletzgus/nextcloud-server,xx621998xx/server,IljaN/core,andreas-p/nextcloud-server,pixelipo/server,owncloud/core,whitekiba/server,Ardinis/server,cernbox/core,lrytz/core,michaelletzgus/nextcloud-server,nextcloud/server,jbicha/server,pollopolea/core,IljaN/core,bluelml/core,Ardinis/server,endsguy/server,cernbox/core,phil-davis/core,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,whitekiba/server,andreas-p/nextcloud-server,pixelipo/server,xx621998xx/server,andreas-p/nextcloud-server,xx621998xx/server,bluelml/core,owncloud/core,jbicha/server,endsguy/server,pmattern/server,xx621998xx/server,sharidas/core,sharidas/core,endsguy/server,IljaN/core,lrytz/core,lrytz/core,pixelipo/server,lrytz/core,cernbox/core,sharidas/core,whitekiba/server,owncloud/core,sharidas/core,xx621998xx/server,pollopolea/core,nextcloud/server,bluelml/core,endsguy/server,pollopolea/core,cernbox/core,IljaN/core,nextcloud/server,Ardinis/server,bluelml/core,Ardinis/server,IljaN/core,bluelml/core,whitekiba/server,pixelipo/server,pmattern/server,pmattern/server