json_test():
  Some simple tests involving JSON files.

collatz_json_test ( ):
  Read the collatz dict from a JSON file.
  Verify that it has information in it already.
  Add some more.

  After retrieval from json file "collatz_dict.json", collatz_dict
  has "length" (number of entries) =  133

  After adding data for n =  100 the Collatz dict
  has "length" (number of entries) =  159

image_json_test ( ):
  Read some information from a JSON file.
  Cake image id =  0001
  Cake image url = "images/0001.jpg"

json_test():
  Normal end of execution.