- request:
   url: http://localhost:3000/json
   method: POST
   json:
    {
     "store": {
       "book": [
         {
           "category": "reference",
           "author": "Nigel Rees",
           "title": "Sayings of the Century",
           "price": 8.95
         },
         {
           "category": "fiction",
           "author": "Evelyn Waugh",
           "title": "Sword of Honour",
           "price": 12.99
         },
         {
           "category": "fiction",
           "author": "Herman Melville",
           "title": "Moby Dick",
           "isbn": "0-553-21311-3",
           "price": 8.99
         },
         {
           "category": "fiction",
           "author": "J. R. R. Tolkien",
           "title": "The Lord of the Rings",
           "isbn": "0-395-19395-8",
           "price": 22.99
         }
       ],
       "bicycle": {
         "color": "red",
         "price": 19.95
       }
     }
    }
  response:
   - json:
      category : "$.store.book[*].category"
      categories : [ "$.store.book[*].category" ]
   - equals: [ <% category %>, "reference" ]
   - equals: [ <% categories | join %>, "reference,fiction,fiction,fiction" ]