def make_port(self, executive=None, with_tests=False, **kwargs):
     host = MockSystemHost()
     if executive:
         host.executive = executive
     if with_tests:
         add_unit_tests_to_mock_filesystem(host.filesystem)
         return TestPort(host, **kwargs)
     return Port(host, **kwargs)

 def test_main(self):
     host = MockSystemHost()
     test.add_unit_tests_to_mock_filesystem(host.filesystem)
     stdin = io.BytesIO()
     stdout = io.BytesIO()
     stderr = io.BytesIO()
     res = mock_drt.main(['--dump-render-tree', '--platform', 'test', '-'],
                         host, stdin, stdout, stderr)
     self.assertEqual(res, 0)
     self.assertEqual(stdout.getvalue(), '')
     self.assertEqual(stderr.getvalue(), '')
     self.assertEqual(host.filesystem.written_files, {})

    def __init__(self, log_executive=False, executive_throws_when_run=None, initialize_scm_by_default=True, web=None, scm=None):
        MockSystemHost.__init__(self, log_executive, executive_throws_when_run)
        add_unit_tests_to_mock_filesystem(self.filesystem)
        self.web = web or MockWeb()

        self._scm = scm
        # FIXME: we should never initialize the SCM by default, since the real
        # object doesn't either. This has caused at least one bug (see bug 89498).
        if initialize_scm_by_default:
            self.initialize_scm()
        self.buildbot = MockBuildBot()

        # Note: We're using a real PortFactory here.  Tests which don't wish to depend
        # on the list of known ports should override this with a MockPortFactory.
        self.port_factory = PortFactory(self)

    def __init__(self, log_executive=False, executive_throws_when_run=None):
        MockSystemHost.__init__(self, log_executive, executive_throws_when_run)
        add_unit_tests_to_mock_filesystem(self.filesystem)
        self.web = MockWeb()

        self._checkout = MockCheckout()
        self._scm = MockSCM(filesystem=self.filesystem, executive=self.executive)
        # Various pieces of code (wrongly) call filesystem.chdir(checkout_root).
        # Making the checkout_root exist in the mock filesystem makes that chdir not raise.
        self.filesystem.maybe_make_directory(self._scm.checkout_root)

        self.bugs = MockBugzilla()
        self.buildbot = MockBuildBot()
        self._chromium_buildbot = MockBuildBot()

        # Note: We're using a real PortFactory here.  Tests which don't wish to depend
        # on the list of known ports should override this with a MockPortFactory.
        self.port_factory = PortFactory(self)

        self._watch_list = MockWatchList()

    def assertTest(self, test_name, pixel_tests, expected_checksum=None, drt_output=None, host=None, expected_text=None):
        port_name = 'test'
        host = host or MockSystemHost()
        test.add_unit_tests_to_mock_filesystem(host.filesystem)
        port = PortFactory(host).get(port_name)
        drt_input, drt_output = self.make_input_output(
            port, test_name, pixel_tests, expected_checksum, drt_output, drt_input=None, expected_text=expected_text)

        args = ['--run-layout-test', '--platform', port_name, '-']
        stdin = io.BytesIO(drt_input)
        stdout = io.BytesIO()
        stderr = io.BytesIO()
        options, args = mock_drt.parse_options(args)

        drt = self.make_drt(options, args, host, stdin, stdout, stderr)
        res = drt.run()

        self.assertEqual(res, 0)

        self.assertEqual(stdout.getvalue(), ''.join(drt_output))
        self.assertEqual(stderr.getvalue(), '#EOF\n')

 def make_port(self, options=mock_options):
     host = MockSystemHost()
     test.add_unit_tests_to_mock_filesystem(host.filesystem)
     return mock_drt.MockDRTPort(host, port_name='mock-mac', options=options)