#!/usr/bin/python
#
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Unit tests for devserver_util module."""

import mox
import os
import shutil
import subprocess
import tempfile
import unittest

import devserver_util
import downloadable_artifact
import gsutil_util


# Fake Dev Server Layout:
TEST_LAYOUT = {
    'test-board-1': ['R17-1413.0.0-a1-b1346', 'R17-18.0.0-a1-b1346'],
    'test-board-2': ['R16-2241.0.0-a0-b2', 'R17-2.0.0-a1-b1346'],
    'test-board-3': []
}


class DevServerUtilTest(mox.MoxTestBase):

  def setUp(self):
    mox.MoxTestBase.setUp(self)
    self._static_dir = tempfile.mkdtemp('devserver_util_unittest')
    self._outside_sandbox_dir = tempfile.mkdtemp('devserver_util_unittest')
    self._install_dir = tempfile.mkdtemp('devserver_util_unittest')

    for board, builds in TEST_LAYOUT.iteritems():
      board_path = os.path.join(self._static_dir, board)
      os.mkdir(board_path)
      for build in builds:
        build_path = os.path.join(board_path, build)
        os.mkdir(build_path)
        with open(os.path.join(build_path,
                               downloadable_artifact.TEST_IMAGE), 'w') as f:
          f.write('TEST_IMAGE')
        with open(os.path.join(
            build_path, downloadable_artifact.STATEFUL_UPDATE), 'w') as f:
          f.write('STATEFUL_UPDATE')
        with open(os.path.join(build_path,
                               downloadable_artifact.ROOT_UPDATE), 'w') as f:
          f.write('ROOT_UPDATE')
        # AU payloads.
        au_dir = os.path.join(build_path, devserver_util.AU_BASE)
        nton_dir = os.path.join(au_dir, build + devserver_util.NTON_DIR_SUFFIX)
        os.makedirs(nton_dir)
        with open(os.path.join(nton_dir,
                               downloadable_artifact.ROOT_UPDATE), 'w') as f:
          f.write('ROOT_UPDATE')
        mton_dir = os.path.join(au_dir, build + devserver_util.MTON_DIR_SUFFIX)
        os.makedirs(mton_dir)
        with open(os.path.join(mton_dir,
                               downloadable_artifact.ROOT_UPDATE), 'w') as f:
          f.write('ROOT_UPDATE')

    self._good_mock_process = self.mox.CreateMock(subprocess.Popen)
    self._good_mock_process.returncode = 0
    self._bad_mock_process = self.mox.CreateMock(subprocess.Popen)
    self._bad_mock_process.returncode = 1

  def tearDown(self):
    shutil.rmtree(self._static_dir)
    shutil.rmtree(self._outside_sandbox_dir)
    shutil.rmtree(self._install_dir)

  def testParsePayloadList(self):
    """Tests we can parse the payload list into urls."""
    archive_url_prefix = ('gs://chromeos-image-archive/x86-mario-release/'
                          'R17-1413.0.0-a1-b1346')
    mton_basename = ('chromeos_R17-1412.0.0-a1-b1345_R17-1413.0.0-a1_'
                     'x86-mario_delta_dev.bin')
    nton_basename = ('chromeos_R17-1413.0.0-a1_R17-1413.0.0-a1_'
                     'x86-mario_delta_dev.bin')
    full_basename = ('chromeos_R17-1413.0.0-a1_x86-mario_full_dev.bin')

    mton_url = '/'.join([archive_url_prefix, mton_basename])
    nton_url = '/'.join([archive_url_prefix, nton_basename])
    full_url = '/'.join([archive_url_prefix, full_basename])

    full_url_out, nton_url_out, mton_url_out = (
        devserver_util.ParsePayloadList(archive_url_prefix,
                                        [full_basename, nton_basename,
                                         mton_basename]))
    self.assertEqual([full_url, nton_url, mton_url],
                     [full_url_out, nton_url_out, mton_url_out])

    archive_url_prefix = ('gs://chromeos-image-archive/x86-alex_he-release/'
                          'R18-1420.0.0-a1-b541')

    mton_basename = ('chromeos_R18-1418.0.0-a1-b54a0_R18-1420.0.0-a1'
                     '_x86-alex_he_delta_dev.bin')
    nton_basename = ('chromeos_R18-1420.0.0-a1_R18-1420.0.0-a1_'
                     'x86-alex_he_delta_dev.bin')
    full_basename = ('chromeos_R18-1420.0.0-a1_x86-alex_he_full_dev.bin')

    mton_url = '/'.join([archive_url_prefix, mton_basename])
    nton_url = '/'.join([archive_url_prefix, nton_basename])
    full_url = '/'.join([archive_url_prefix, full_basename])

    full_url_out, nton_url_out, mton_url_out = (
        devserver_util.ParsePayloadList(archive_url_prefix,
                                        [full_basename, nton_basename,
                                         mton_basename]))
    self.assertEqual([full_url, nton_url, mton_url],
                     [full_url_out, nton_url_out, mton_url_out])

  def testParsePayloadListWithoutDeltas(self):
    """Tests we can parse the payload list when no delta updates exist."""
    archive_url_prefix = ('gs://chromeos-image-archive/x86-mario-release/'
                          'R17-1413.0.0-a1-b1346')
    full_basename = ('chromeos_R17-1413.0.0-a1_x86-mario_full_dev.bin')
    full_url = '/'.join([archive_url_prefix, full_basename])
    full_url_out, nton_url_out, mton_url_out = (
        devserver_util.ParsePayloadList(archive_url_prefix,
                                        [full_basename, '', '']))
    self.assertEqual([full_url, None, None],
                     [full_url_out, nton_url_out, mton_url_out])

  def testParsePartialPayloadList(self):
    """Tests that we can parse a payload list with missing optional payload."""
    archive_url_prefix = ('gs://chromeos-image-archive/x86-mario-release/'
                          'R17-1413.0.0-a1-b1346/')
    nton_basename = ('chromeos_R17-1413.0.0-a1_R17-1413.0.0-a1_x86-'
                     'mario_delta_dev.bin')
    full_basename = ('chromeos_R17-1413.0.0-a1_x86-mario_full_dev.bin')

    nton_url = '/'.join([archive_url_prefix, nton_basename])
    full_url = '/'.join([archive_url_prefix, full_basename])

    full_url_out, nton_url_out, mton_url_out = (
        devserver_util.ParsePayloadList(archive_url_prefix,
                                        [full_basename, nton_basename]))
    self.assertEqual([full_url, nton_url, None],
                     [full_url_out, nton_url_out, mton_url_out])

  def testInstallBuild(self):
    # TODO(frankf): Implement this test
    # self.fail('Not implemented.')
    pass

  def testPrepareAutotestPkgs(self):
    # TODO(frankf): Implement this test
    # self.fail('Not implemented.')
    # TODO: implement
    pass

  def testSafeSandboxAccess(self):
    # Path is in sandbox.
    self.assertTrue(
        devserver_util.SafeSandboxAccess(
            self._static_dir, os.path.join(self._static_dir, 'some-board')))

    # Path is sandbox.
    self.assertFalse(
        devserver_util.SafeSandboxAccess(self._static_dir, self._static_dir))

    # Path is outside the sandbox.
    self.assertFalse(
        devserver_util.SafeSandboxAccess(self._static_dir,
                                         self._outside_sandbox_dir))

    # Path contains '..'.
    self.assertFalse(
        devserver_util.SafeSandboxAccess(
            self._static_dir, os.path.join(self._static_dir, os.pardir)))

    # Path contains symbolic link references.
    os.chdir(self._static_dir)
    os.symlink(os.pardir, 'parent')
    self.assertFalse(
        devserver_util.SafeSandboxAccess(
            self._static_dir, os.path.join(self._static_dir, os.pardir)))

  def testAcquireReleaseLocks(self):
    # Successful lock and unlock.
    lock_file = devserver_util.AcquireLock(self._static_dir, 'test-lock')
    self.assertTrue(os.path.exists(lock_file))
    devserver_util.ReleaseLock(self._static_dir, 'test-lock')
    self.assertFalse(os.path.exists(lock_file))

    # Attempt to lock an existing directory.
    devserver_util.AcquireLock(self._static_dir, 'test-lock')
    self.assertRaises(devserver_util.DevServerUtilError,
                      devserver_util.AcquireLock, self._static_dir, 'test-lock')

  def testFindMatchingBoards(self):
    for key in TEST_LAYOUT:
      # Partial match with multiple boards.
      self.assertEqual(
          set(devserver_util.FindMatchingBoards(self._static_dir, key[:-5])),
          set(TEST_LAYOUT.keys()))

      # Absolute match.
      self.assertEqual(
          devserver_util.FindMatchingBoards(self._static_dir, key), [key])

    # Invalid partial match.
    self.assertEqual(
        devserver_util.FindMatchingBoards(self._static_dir, 'asdfsadf'), [])

  def testFindMatchingBuilds(self):
    # Try a partial board and build match with single match.
    self.assertEqual(
        devserver_util.FindMatchingBuilds(self._static_dir, 'test-board',
                                          'R17-1413'),
        [('test-board-1', 'R17-1413.0.0-a1-b1346')])

    # Try a partial board and build match with multiple match.
    actual = set(devserver_util.FindMatchingBuilds(
        self._static_dir, 'test-board', 'R17'))
    expected = set([('test-board-1', 'R17-1413.0.0-a1-b1346'),
                    ('test-board-1', 'R17-18.0.0-a1-b1346'),
                    ('test-board-2', 'R17-2.0.0-a1-b1346')])
    self.assertEqual(actual, expected)

  def testGetLatestBuildVersion(self):
    self.assertEqual(
        devserver_util.GetLatestBuildVersion(self._static_dir, 'test-board-1'),
        'R17-1413.0.0-a1-b1346')

  def testGetLatestBuildVersionLatest(self):
    """Test that we raise DevServerUtilError when a build dir is empty."""
    self.assertRaises(devserver_util.DevServerUtilError,
                      devserver_util.GetLatestBuildVersion,
                      self._static_dir, 'test-board-3')

  def testGetLatestBuildVersionUnknownBuild(self):
    """Test that we raise DevServerUtilError when a build dir does not exist."""
    self.assertRaises(devserver_util.DevServerUtilError,
                      devserver_util.GetLatestBuildVersion,
                      self._static_dir, 'bad-dir')

  def testGetLatestBuildVersionMilestone(self):
    """Test that we can get builds based on milestone."""
    expected_build_str = 'R16-2241.0.0-a0-b2'
    milestone = 'R16'
    build_str = devserver_util.GetLatestBuildVersion(
        self._static_dir, 'test-board-2', milestone)
    self.assertEqual(expected_build_str, build_str)

  def testCloneBuild(self):
    test_prefix = 'abc'
    test_tag = test_prefix + '/123'
    abc_path = os.path.join(self._static_dir, devserver_util.DEV_BUILD_PREFIX,
                            test_tag)

    os.mkdir(os.path.join(self._static_dir, test_prefix))

    # Verify leaf path is created and proper values returned.
    board, builds = TEST_LAYOUT.items()[0]
    dev_build = devserver_util.CloneBuild(self._static_dir, board, builds[0],
                                          test_tag)
    self.assertEquals(dev_build, abc_path)
    self.assertTrue(os.path.exists(abc_path))
    self.assertTrue(os.path.isfile(os.path.join(
        abc_path, downloadable_artifact.TEST_IMAGE)))
    self.assertTrue(os.path.isfile(os.path.join(
        abc_path, downloadable_artifact.ROOT_UPDATE)))
    self.assertTrue(os.path.isfile(os.path.join(
        abc_path, downloadable_artifact.STATEFUL_UPDATE)))

    # Verify force properly removes the old directory.
    junk_path = os.path.join(dev_build, 'junk')
    with open(junk_path, 'w') as f:
      f.write('hello!')
    remote_dir = devserver_util.CloneBuild(
        self._static_dir, board, builds[0], test_tag, force=True)
    self.assertEquals(remote_dir, abc_path)
    self.assertTrue(os.path.exists(abc_path))
    self.assertTrue(os.path.isfile(os.path.join(
        abc_path, downloadable_artifact.TEST_IMAGE)))
    self.assertTrue(os.path.isfile(os.path.join(
        abc_path, downloadable_artifact.ROOT_UPDATE)))
    self.assertTrue(os.path.isfile(os.path.join(
        abc_path, downloadable_artifact.STATEFUL_UPDATE)))
    self.assertFalse(os.path.exists(junk_path))

  def testGetControlFile(self):
    control_file_dir = os.path.join(
        self._static_dir, 'test-board-1', 'R17-1413.0.0-a1-b1346', 'autotest',
        'server', 'site_tests', 'network_VPN')
    os.makedirs(control_file_dir)
    with open(os.path.join(control_file_dir, 'control'), 'w') as f:
      f.write('hello!')

    control_content = devserver_util.GetControlFile(
        self._static_dir, 'test-board-1/R17-1413.0.0-a1-b1346',
        os.path.join('server', 'site_tests', 'network_VPN', 'control'))
    self.assertEqual(control_content, 'hello!')

  def testListAutoupdateTargets(self):
    for board, builds in TEST_LAYOUT.iteritems():
      for build in builds:
        au_targets = devserver_util.ListAutoupdateTargets(self._static_dir,
                                                          board, build)
        self.assertEqual(set(au_targets),
                         set([build + devserver_util.NTON_DIR_SUFFIX,
                              build + devserver_util.MTON_DIR_SUFFIX]))

  def testGatherArtifactDownloads(self):
    """Tests that we can gather the correct download requirements."""
    build = 'R17-1413.0.0-a1-b1346'
    archive_url_prefix = ('gs://chromeos-image-archive/x86-mario-release/' +
                          build)
    mock_data = 'mock data\nmock_data'
    payloads = map(lambda x: '/'.join([archive_url_prefix, x]),
                   ['p1', 'p2', 'p3'])
    expected_payloads = payloads + map(
        lambda x: '/'.join([archive_url_prefix, x]),
            [downloadable_artifact.STATEFUL_UPDATE,
             downloadable_artifact.AUTOTEST_ZIPPED_PACKAGE,
             downloadable_artifact.TEST_SUITES_PACKAGE])
    self.mox.StubOutWithMock(gsutil_util, 'GSUtilRun')
    self.mox.StubOutWithMock(devserver_util, 'IsAvailable')
    self.mox.StubOutWithMock(devserver_util, 'ParsePayloadList')

    # GSUtil cat gs://archive_url_prefix/UPLOADED.
    gsutil_util.GSUtilRun(mox.StrContains(devserver_util.UPLOADED_LIST),
                          mox.IgnoreArg()).AndReturn(mock_data)
    devserver_util.IsAvailable(mox.IgnoreArg(),
                               mock_data.splitlines()).AndReturn(True)
    devserver_util.ParsePayloadList(archive_url_prefix,
                                    mock_data.splitlines()).AndReturn(payloads)

    self.mox.ReplayAll()
    artifacts = devserver_util.GatherArtifactDownloads(
        self._static_dir, archive_url_prefix, build, self._install_dir)
    for index, artifact in enumerate(artifacts):
      self.assertEqual(artifact._gs_path, expected_payloads[index])
      self.assertTrue(artifact._tmp_staging_dir.startswith(self._static_dir))

    self.mox.VerifyAll()

  def testGatherArtifactDownloadsWithoutMton(self):
    """Gather the correct download requirements without mton delta."""
    build = 'R17-1413.0.0-a1-b1346'
    archive_url_prefix = ('gs://chromeos-image-archive/x86-mario-release/' +
                          build)
    mock_data = 'mock data\nmock_data\nmock_data'
    payloads = map(lambda x: '/'.join([archive_url_prefix, x]),
                   ['p1', 'p2'])
    expected_payloads = payloads + map(
        lambda x: '/'.join([archive_url_prefix, x]),
            [downloadable_artifact.STATEFUL_UPDATE,
             downloadable_artifact.AUTOTEST_ZIPPED_PACKAGE,
             downloadable_artifact.TEST_SUITES_PACKAGE])
    self.mox.StubOutWithMock(gsutil_util, 'GSUtilRun')
    self.mox.StubOutWithMock(devserver_util, 'IsAvailable')
    self.mox.StubOutWithMock(devserver_util, 'ParsePayloadList')

    # GSUtil cat gs://archive_url_prefix/UPLOADED.
    gsutil_util.GSUtilRun(mox.StrContains(devserver_util.UPLOADED_LIST),
                          mox.IgnoreArg()).AndReturn(mock_data)
    devserver_util.IsAvailable(mox.IgnoreArg(),
                               mock_data.splitlines()).AndReturn(True)
    devserver_util.ParsePayloadList(archive_url_prefix,
                                    mock_data.splitlines()
                                    ).AndReturn(payloads + [None])

    self.mox.ReplayAll()
    artifacts = devserver_util.GatherArtifactDownloads(
        self._static_dir, archive_url_prefix, build, self._install_dir)
    for index, artifact in enumerate(artifacts):
      self.assertEqual(artifact._gs_path, expected_payloads[index])
      self.assertTrue(artifact._tmp_staging_dir.startswith(self._static_dir))

    self.mox.VerifyAll()

  def testGatherArtifactDownloadsWithoutMtonOrNton(self):
    """Gather the correct download requirements without delta payloads."""
    build = 'R17-1413.0.0-a1-b1346'
    archive_url_prefix = ('gs://chromeos-image-archive/x86-mario-release/' +
                          build)
    mock_data = 'mock data\nmock_data'

    payloads = map(lambda x: '/'.join([archive_url_prefix, x]),
                   ['p1'])
    expected_payloads = payloads + map(
        lambda x: '/'.join([archive_url_prefix, x]),
            [downloadable_artifact.STATEFUL_UPDATE,
             downloadable_artifact.AUTOTEST_ZIPPED_PACKAGE,
             downloadable_artifact.TEST_SUITES_PACKAGE])
    self.mox.StubOutWithMock(gsutil_util, 'GSUtilRun')
    self.mox.StubOutWithMock(devserver_util, 'IsAvailable')
    self.mox.StubOutWithMock(devserver_util, 'ParsePayloadList')

    # GSUtil cat gs://archive_url_prefix/UPLOADED.
    gsutil_util.GSUtilRun(mox.StrContains(devserver_util.UPLOADED_LIST),
                          mox.IgnoreArg()).AndReturn(mock_data)
    devserver_util.IsAvailable(mox.IgnoreArg(),
                               mock_data.splitlines()).AndReturn(True)
    devserver_util.ParsePayloadList(archive_url_prefix,
                                    mock_data.splitlines()
                                    ).AndReturn(payloads + [None, None])

    self.mox.ReplayAll()
    artifacts = devserver_util.GatherArtifactDownloads(
        self._static_dir, archive_url_prefix, build, self._install_dir)
    for index, artifact in enumerate(artifacts):
      self.assertEqual(artifact._gs_path, expected_payloads[index])
      self.assertTrue(artifact._tmp_staging_dir.startswith(self._static_dir))

    self.mox.VerifyAll()

  def testGatherSymbolArtifactDownloads(self):
    """Tests that we can find debug symbol artifacts to download."""
    build = 'R17-1413.0.0-a1-b1346'
    archive_url_prefix = ('gs://chromeos-image-archive/x86-mario-release/' +
                          build)
    symbol_url = '/'.join([archive_url_prefix,
                           downloadable_artifact.DEBUG_SYMBOLS])
    uploaded_list_url = '/'.join([archive_url_prefix,
                                  devserver_util.UPLOADED_LIST])
    mock_data = 'mock-tarball.tgz\nmock-debug.tgz'
    self.mox.StubOutWithMock(gsutil_util, 'GSUtilRun')

    # GSUtil cat gs://archive_url_prefix/UPLOADED.
    gsutil_util.GSUtilRun(mox.StrContains(devserver_util.UPLOADED_LIST),
                          mox.IgnoreArg()).AndReturn(mock_data)

    self.mox.ReplayAll()
    artifacts = devserver_util.GatherSymbolArtifactDownloads(
        self._static_dir, archive_url_prefix, self._install_dir)
    for index, artifact in enumerate(artifacts):
      self.assertEqual(artifact._gs_path, symbol_url)
      self.assertTrue(artifact._tmp_staging_dir.startswith(self._static_dir))

    self.mox.VerifyAll()

  def testIsAvailable(self):
    """Test that we can detect whether the target artifacts are avaialble."""
    # Test when the all target files are available
    pattern_list = ['_full_', 'autotest.tar']
    uploaded_list = ['chromeos_R17-1413.0.0-a1_x86-mario_full_dev.bin',
                     'debug.tgz',
                     'autotest.tar.bz2']

    available = devserver_util.IsAvailable(pattern_list, uploaded_list)
    self.assertTrue(available)

    # Test when some target files are missing
    pattern_list = ['_full_', 'autotest.tar']
    uploaded_list = ['chromeos_R17-1413.0.0-a1_x86-mario_full_dev.bin',
                     'debug.tgz']

    available = devserver_util.IsAvailable(pattern_list, uploaded_list)
    self.assertFalse(available)

  def testWaitUntilAvailable(self):
    """Test that we can poll until all target artifacts are available."""
    build = 'R17-1413.0.0-a1-b1346'
    archive_url = ('gs://chromeos-image-archive/x86-mario-release/'
                   'R17-1413.0.0-a1-b1346')
    to_wait_list = ['_full_']
    mock_data = 'mock data\nmock_data\nmock_data'

    self.mox.StubOutWithMock(gsutil_util, 'GSUtilRun')
    self.mox.StubOutWithMock(devserver_util, 'IsAvailable')

    # GSUtil cat gs://archive_url_prefix/UPLOADED.
    gsutil_util.GSUtilRun(mox.StrContains(devserver_util.UPLOADED_LIST),
                          mox.IgnoreArg()).AndReturn(mock_data)
    devserver_util.IsAvailable(mox.IgnoreArg(), mox.IgnoreArg()).AndReturn(True)

    self.mox.ReplayAll()
    uploaded_list = devserver_util.WaitUntilAvailable(to_wait_list, archive_url,
                                                      'UNIT TEST', delay=1)
    self.assertEqual(uploaded_list, mock_data.splitlines())
    self.mox.VerifyAll()

  def testWaitUntilAvailableWithRetry(self):
    """Test that we can poll until all target artifacts are available."""
    build = 'R17-1413.0.0-a1-b1346'
    archive_url = ('gs://chromeos-image-archive/x86-mario-release/'
                   'R17-1413.0.0-a1-b1346')
    to_wait_list = ['_full_']
    mock_data = 'mock data\nmock_data\nmock_data'

    self.mox.StubOutWithMock(gsutil_util, 'GSUtilRun')
    self.mox.StubOutWithMock(devserver_util, 'IsAvailable')

    # GSUtil cat gs://archive_url_prefix/UPLOADED.
    gsutil_util.GSUtilRun(mox.StrContains(devserver_util.UPLOADED_LIST),
                          mox.IgnoreArg()).AndReturn(mock_data)
    devserver_util.IsAvailable(mox.IgnoreArg(),
                               mox.IgnoreArg()).AndReturn(False)

    gsutil_util.GSUtilRun(mox.StrContains(devserver_util.UPLOADED_LIST),
                          mox.IgnoreArg()).AndReturn(mock_data)
    devserver_util.IsAvailable(mox.IgnoreArg(), mox.IgnoreArg()).AndReturn(True)

    self.mox.ReplayAll()
    uploaded_list = devserver_util.WaitUntilAvailable(to_wait_list, archive_url,
                                                      'UNIT TEST', delay=1)
    self.assertEqual(uploaded_list, mock_data.splitlines())
    self.mox.VerifyAll()

  def testWaitUntilAvailableTimeout(self):
    """Test that we wait for the target artifacts until timeout occurs."""
    build = 'R17-1413.0.0-a1-b1346'
    archive_url = ('gs://chromeos-image-archive/x86-mario-release/'
                   'R17-1413.0.0-a1-b1346')
    to_wait_list = ['_full_']
    mock_data = 'mock data\nmock_data\nmock_data'

    self.mox.StubOutWithMock(gsutil_util, 'GSUtilRun')
    self.mox.StubOutWithMock(devserver_util, 'IsAvailable')

    # GSUtil cat gs://archive_url_prefix/UPLOADED.
    gsutil_util.GSUtilRun(mox.StrContains(devserver_util.UPLOADED_LIST),
                          mox.IgnoreArg()).AndReturn(mock_data)
    devserver_util.IsAvailable(mox.IgnoreArg(),
                               mox.IgnoreArg()).AndReturn(False)

    self.mox.ReplayAll()
    self.assertRaises(devserver_util.DevServerUtilError,
                      devserver_util.WaitUntilAvailable,
                      to_wait_list,
                      archive_url,
                      'UNIT TEST',
                      delay=2,
                      timeout=1)
    self.mox.VerifyAll()

if __name__ == '__main__':
  unittest.main()