Provide better asynchronous support for jasmine-node

async_helper.coffee

# Monkey patch jasmine.Env to wrap spec ('it', 'beforeEach', 'afterEach')
# in async handler if it expects a done callback
withoutAsync = {}
for jasmineFunction in [ "it", "beforeEach", "afterEach"]
  do (jasmineFunction) ->
    withoutAsync[jasmineFunction] = jasmine.Env.prototype[jasmineFunction]
    jasmine.Env.prototype[jasmineFunction] = (args...) ->
      specFunction = args.pop()
      # No async callback expected, so not async
      if specFunction.length == 0 
        args.push specFunction
      else
        args.push -> asyncSpec(specFunction, @)

      withoutAsync[jasmineFunction].apply @, args

# Run any function, failing the current spec if there is an error or it times out
asyncSpec = (specFunction, spec, timeout = 1000) ->
  done = false
  spec.runs ->
    try
      specFunction (error) ->
        done = true
        spec.fail(error) if error?
    catch e
      # if we hit an exception before any async code, mark the spec done
      done = true
      throw e
  spec.waitsFor ->
    done == true
  , "spec to complete", timeout