"""Set a JS timer that expires after exiting preload mode."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import _env  # pylint: disable=unused-import

from cobalt.black_box_tests import black_box_tests
from cobalt.black_box_tests.threaded_web_server import ThreadedWebServer


class PreloadVisibilityTest(black_box_tests.BlackBoxTestCase):

  def test_simple(self):

    with ThreadedWebServer() as server:
      url = server.GetURL(file_name='testdata/preload_visibility.html')

      with self.CreateCobaltRunner(
          url=url, target_params=['--preload']) as runner:
        runner.WaitForJSTestsSetup()
        self.assertTrue(runner.IsInPreload())
        runner.SendResume()
        self.assertTrue(runner.JSTestsSucceeded())