type = JCON::parse "[string, int]"
type.contains?([‘a’, 1])     # => true
type.contains?([‘a’, ‘b’])   # => false
type.contains?([‘a’, 1, 2])  # => true

[1, ‘xyzzy’].should conform_to_js(‘[int, string]’)
[1, 2, ‘xyzzy’].should_not conform_to_js(‘[int, string]’)  # 2 isn’t a string
{:x => 1}.should conform_to_js(‘{x: int}’)

# this will succeed if e.g. response contains a script tag that includes
#   fn("id", {x:1, y:2}, true)
response.should call_js(‘fn’) do |args|
  args[0].should conform_to_js(‘string’)
  args[1].should conform_to_js(‘{x:int, y:int}’)
  args[2].should conform_to_js(‘boolean’)
  # or:
  args.should conform_to_js(‘[string, {x:int, y:int}, boolean]’)
end