Added more tests for json output based on existing yaml ones.
Added more tests for json output based on existing yaml ones.

alesstimec/juju,frankban/juju,mjs/juju,frankban/juju,kat-co/juju,mjs/juju,perrito666/juju,mjs/juju,bz2/juju,howbazaar/juju,gabriel-samfira/juju,axw/juju,alesstimec/juju,mikemccracken/juju,bac/juju,marcmolla/juju,macgreagoir/juju,macgreagoir/juju,ericsnowcurrently/juju,waigani/juju,dimitern/juju,axw/juju,marcmolla/juju,howbazaar/juju,gabriel-samfira/juju,mikemccracken/juju,bac/juju,bz2/juju,perrito666/juju,mjs/juju,anastasiamac/juju,anastasiamac/juju,perrito666/juju,alesstimec/juju,anastasiamac/juju,AdamIsrael/juju,frankban/juju,reedobrien/juju,dimitern/juju,ericsnowcurrently/juju,dimitern/juju,AdamIsrael/juju,reedobrien/juju,bac/juju,waigani/juju,marcmolla/juju,mikemccracken/juju,ericsnowcurrently/juju,AdamIsrael/juju,kat-co/juju,frankban/juju,frankban/juju,bac/juju,marcmolla/juju,kat-co/juju,howbazaar/juju,mjs/juju,axw/juju,mjs/juju,macgreagoir/juju,marcmolla/juju,ericsnowcurrently/juju,reedobrien/juju,bac/juju,howbazaar/juju,anastasiamac/juju,bz2/juju,kat-co/juju,anastasiamac/juju,perrito666/juju,reedobrien/juju,axw/juju,ericsnowcurrently/juju,reedobrien/juju,alesstimec/juju,alesstimec/juju,bz2/juju,perrito666/juju,gabriel-samfira/juju,mikemccracken/juju,waigani/juju,bz2/juju,mikemccracken/juju,mjs/juju,dimitern/juju,gabriel-samfira/juju,gabriel-samfira/juju,howbazaar/juju,dimitern/juju,waigani/juju,macgreagoir/juju,AdamIsrael/juju,macgreagoir/juju,axw/juju,kat-co/juju