Test = {
   description = "Test if it's possible to open dev",

   -- global/toplevel parameters array
   params = {
      fmt = { 'RGB888', 'YUV422' },
   },

   actions = {

      {  name = 'open',
     params = {
        dev = { '/dev/video0', '/dev/video3', '/dev/video4' },
     },
     child = {
        { name = 'query_cap' },
        { name = 'set_fmt',
          params = { 'NEW_FMT', 'ANOTHER_ONE', },
          child = {
                  { name = 'make me sth to eat',
                    params = { what = 'pizza' },
                  },
              },
            },
     },
      }

      {  name = 'hmm' },
      {  name = 'dont-know-yet' },

   }