ubuntu@localhost:~$ SNAPPY_USE_STAGING_CPI=1 sudo snappy install hello-world.canonical
Installing hello-world.canonical
20.00 KB / 20.00 KB [========================================================>_] 100.00 % 109.75 KB/s 
Name               Date       Version                 Developer 
canonical-pc       2016-02-02 3.0                               
canonical-pc-linux 2016-03-21 4.4.0-14+20160321.17-32 sideload  
hello-world        2016-03-11 6.0                     canonical 
ubuntu-core        2016-04-05 16.04+20160405.14-23    sideload  
ubuntu@localhost:~$ SNAPPY_USE_STAGING_CPI=1 sudo snappy install basic.snappy-test
Installing basic.snappy-test
basic.snappy-test failed to install: snap not found