disintegrate

gistfile1.coffee

disintegrate = (fn) ->
  tests = []
  ret_fn = (args...) ->
    args_saved = JSON.stringify(args)
    res = fn.apply(this, args)
    res_saved = JSON.stringify(res)
    tests.push {args:args_saved,res:res_saved}
    return res
  ret_fn.tests = tests
  ret_fn

b = disintegrate (x) ->
  x*x
a = (x) ->
  b(x + 3)

a()
a(4)
console.log b.tests
# [ { args: '[null]', res: 'null' }, { args: '[7]', res: '49' } ]