test/support: ContextDir#readFile() accepts same options as fs
test/support: ContextDir#readFile() accepts same options as fs

cozy-labs/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop