heat_template_version: 2014-10-16 
 
description: This is a test heat template 
 
parameters: 
 
  testparam: 
    type: string 
    description: This is a test parameter
 
resources: 
 
  test_resource: 
    type: OS::Heat::RandomString 
    properties: 
      length: { get_param: testparam }