jashkenas--coffeescript/test/generators.coffee

# Generators
# -----------------

# * Generator Definition

# ensure that these tests are only run if generators are available
generatorsAreAvailable = ->
  for execArg in process.execArgv when execArg in ['--harmony', '--harmony-generators']
    return yes
  no

if generatorsAreAvailable()

  # Using the keyword yield should not cause a syntax error.
  -> yield 0

  test "Generator Definition", ->
    x = ->
      yield 0
      yield 1
      yield 2
    y = x()
    z = y.next()
    eq z.value, 0
    eq z.done, false
    z = y.next()
    eq z.value, 1
    eq z.done, false
    z = y.next()
    eq z.value, 2
    eq z.done, false
    z = y.next()
    eq z.value, undefined
    eq z.done, true