This patch includes tests for the remaining REST API commands:
POST /shell/output
POST /session
POST /poweroff
POST /reboot
POST /stop
POST /refresh
POST /hardware
POST /software
POST /image/create
POST /image/restore
POST /setup
POST /image/create/basic
POST /image/create/incremental
POST /image/restore/basic
POST /image/restore/incremental
POST /run/schedule
This test covers requests that are missing one of the parameters in its
payload.