backend: use 'goapp test' instead of 'go test'
backend: use 'goapp test' instead of 'go test'

It's faster, and doesn't show firewall popups on MacOS.

google/ioweb2016,GoogleChrome/ioweb2016,GoogleChrome/ioweb2016,google/ioweb2016,GoogleChrome/ioweb2016,google/ioweb2016,google/ioweb2016,GoogleChrome/ioweb2016