# Copyright (C) 2010 Google Inc. All rights reserved.
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"""Unit testing base class for Port implementations."""

import errno
import logging
import os
import socket
import sys
import time
import unittest

from webkitpy.common.system.executive_mock import MockExecutive
from webkitpy.common.system.filesystem_mock import MockFileSystem
from webkitpy.common.system.outputcapture import OutputCapture
from webkitpy.common.system.systemhost_mock import MockSystemHost
from webkitpy.layout_tests.port.base import Port
from webkitpy.layout_tests.port.config_mock import MockConfig
from webkitpy.layout_tests.port.server_process_mock import MockServerProcess
from webkitpy.layout_tests.servers import http_server_base
from webkitpy.tool.mocktool import MockOptions


# FIXME: get rid of this fixture
class TestWebKitPort(Port):
    port_name = "testwebkitport"

    def __init__(self, symbols_string=None,
                 expectations_file=None, skips_file=None, host=None, config=None,
                 **kwargs):
        self.symbols_string = symbols_string  # Passing "" disables all staticly-detectable features.
        host = host or MockSystemHost()
        config = config or MockConfig()
        super(TestWebKitPort, self).__init__(host=host, config=config, **kwargs)

    def all_test_configurations(self):
        return [self.test_configuration()]

    def _symbols_string(self):
        return self.symbols_string

    def _tests_for_other_platforms(self):
        return ["media", ]

    def _tests_for_disabled_features(self):
        return ["accessibility", ]


class PortTestCase(unittest.TestCase):
    """Tests that all Port implementations must pass."""
    HTTP_PORTS = (8000, 8080, 8443)
    WEBSOCKET_PORTS = (8880,)

    # Subclasses override this to point to their Port subclass.
    os_name = None
    os_version = None
    port_maker = TestWebKitPort

    def make_port(self, host=None, port_name=None, options=None, os_name=None, os_version=None, config=None, **kwargs):
        host = host or MockSystemHost(os_name=(os_name or self.os_name), os_version=(os_version or self.os_version))
        options = options or MockOptions(configuration='Release')
        config = config or MockConfig(filesystem=host.filesystem, default_configuration='Release')
        port_name = port_name or self.port_name
        port_name = self.port_maker.determine_full_port_name(host, options, port_name)
        return self.port_maker(host, port_name, options=options, config=config, **kwargs)

    def test_default_max_locked_shards(self):
        port = self.make_port()
        port.default_child_processes = lambda: 16
        self.assertEquals(port.default_max_locked_shards(), 1)
        port.default_child_processes = lambda: 2
        self.assertEquals(port.default_max_locked_shards(), 1)

    def test_default_timeout_ms(self):
        self.assertEquals(self.make_port(options=MockOptions(configuration='Release')).default_timeout_ms(), 35000)
        self.assertEquals(self.make_port(options=MockOptions(configuration='Debug')).default_timeout_ms(), 35000)

    def test_default_pixel_tests(self):
        self.assertEquals(self.make_port().default_pixel_tests(), False)

    def test_driver_cmd_line(self):
        port = self.make_port()
        self.assertTrue(len(port.driver_cmd_line()))

        options = MockOptions(additional_drt_flag=['--foo=bar', '--foo=baz'])
        port = self.make_port(options=options)
        cmd_line = port.driver_cmd_line()
        self.assertTrue('--foo=bar' in cmd_line)
        self.assertTrue('--foo=baz' in cmd_line)

    def test_expectations_files(self):
        self.assertNotEquals(self.make_port().expectations_files(), [])

    def test_uses_apache(self):
        self.assertTrue(self.make_port()._uses_apache())

    def assert_servers_are_down(self, host, ports):
        for port in ports:
            try:
                test_socket = socket.socket()
                test_socket.connect((host, port))
                self.fail()
            except IOError, e:
                self.assertTrue(e.errno in (errno.ECONNREFUSED, errno.ECONNRESET))
            finally:
                test_socket.close()

    def assert_servers_are_up(self, host, ports):
        for port in ports:
            try:
                test_socket = socket.socket()
                test_socket.connect((host, port))
            except IOError, e:
                self.fail('failed to connect to %s:%d' % (host, port))
            finally:
                test_socket.close()

    def integration_test_http_lock(self):
        port = self.make_port()
        # Only checking that no exception is raised.
        port.acquire_http_lock()
        port.release_http_lock()

    def integration_test_check_sys_deps(self):
        port = self.make_port()
        # Only checking that no exception is raised.
        port.check_sys_deps(True)

    def integration_test_helper(self):
        port = self.make_port()
        # Only checking that no exception is raised.
        port.start_helper()
        port.stop_helper()

    def integration_test_http_server__normal(self):
        port = self.make_port()
        self.assert_servers_are_down('localhost', self.HTTP_PORTS)
        port.start_http_server()
        self.assert_servers_are_up('localhost', self.HTTP_PORTS)
        port.stop_http_server()
        self.assert_servers_are_down('localhost', self.HTTP_PORTS)

    def integration_test_http_server__fails(self):
        port = self.make_port()
        # Test that if a port isn't available, the call fails.
        for port_number in self.HTTP_PORTS:
            test_socket = socket.socket()
            try:
                try:
                    test_socket.bind(('localhost', port_number))
                except socket.error, e:
                    if e.errno in (errno.EADDRINUSE, errno.EALREADY):
                        self.fail('could not bind to port %d' % port_number)
                    raise
                try:
                    port.start_http_server()
                    self.fail('should not have been able to start the server while bound to %d' % port_number)
                except http_server_base.ServerError, e:
                    pass
            finally:
                port.stop_http_server()
                test_socket.close()

        # Test that calling start() twice fails.
        try:
            port.start_http_server()
            self.assertRaises(AssertionError, port.start_http_server)
        finally:
            port.stop_http_server()

    def integration_test_http_server__two_servers(self):
        # Test that calling start() on two different ports causes the
        # first port to be treated as stale and killed.
        port = self.make_port()
        # Test that if a port isn't available, the call fails.
        port.start_http_server()
        new_port = self.make_port()
        try:
            new_port.start_http_server()

            # Check that the first server was killed.
            self.assertFalse(port._executive.check_running_pid(port._http_server._pid))

            # Check that there is something running.
            self.assert_servers_are_up('localhost', self.HTTP_PORTS)

            # Test that calling stop() on a killed server is harmless.
            port.stop_http_server()
        finally:
            port.stop_http_server()
            new_port.stop_http_server()

            # Test that calling stop() twice is harmless.
            new_port.stop_http_server()

    def integration_test_image_diff(self):
        port = self.make_port()
        # FIXME: This test will never run since we are using a MockFilesystem for these tests!?!?
        if not port.check_image_diff():
            # The port hasn't been built - don't run the tests.
            return

        dir = port.layout_tests_dir()
        file1 = port._filesystem.join(dir, 'fast', 'css', 'button_center.png')
        contents1 = port._filesystem.read_binary_file(file1)
        file2 = port._filesystem.join(dir, 'fast', 'css',
                                      'remove-shorthand-expected.png')
        contents2 = port._filesystem.read_binary_file(file2)
        tmpfd, tmpfile = port._filesystem.open_binary_tempfile('')
        tmpfd.close()

        self.assertFalse(port.diff_image(contents1, contents1)[0])
        self.assertTrue(port.diff_image(contents1, contents2)[0])

        self.assertTrue(port.diff_image(contents1, contents2, tmpfile)[0])

        port._filesystem.remove(tmpfile)

    def test_diff_image__missing_both(self):
        port = self.make_port()
        self.assertFalse(port.diff_image(None, None)[0])
        self.assertFalse(port.diff_image(None, '')[0])
        self.assertFalse(port.diff_image('', None)[0])

        self.assertFalse(port.diff_image('', '')[0])

    def test_diff_image__missing_actual(self):
        port = self.make_port()
        self.assertTrue(port.diff_image(None, 'foo')[0])
        self.assertTrue(port.diff_image('', 'foo')[0])

    def test_diff_image__missing_expected(self):
        port = self.make_port()
        self.assertTrue(port.diff_image('foo', None)[0])
        self.assertTrue(port.diff_image('foo', '')[0])

    def test_diff_image(self):
        port = self.make_port()
        self.proc = None

        def make_proc(port, nm, cmd, env):
            self.proc = MockServerProcess(port, nm, cmd, env, lines=['diff: 100% failed\n', 'diff: 100% failed\n'])
            return self.proc

        port._server_process_constructor = make_proc
        port.setup_test_run()
        self.assertEquals(port.diff_image('foo', 'bar'), ('', 100.0, None))
        self.assertEquals(self.proc.cmd[1:3], ["--tolerance", "0.1"])

        self.assertEquals(port.diff_image('foo', 'bar', None), ('', 100.0, None))
        self.assertEquals(self.proc.cmd[1:3], ["--tolerance", "0.1"])

        self.assertEquals(port.diff_image('foo', 'bar', 0), ('', 100.0, None))
        self.assertEquals(self.proc.cmd[1:3], ["--tolerance", "0"])

        port.clean_up_test_run()
        self.assertTrue(self.proc.stopped)
        self.assertEquals(port._image_differ, None)

    def test_diff_image_crashed(self):
        port = self.make_port()
        self.proc = None

        def make_proc(port, nm, cmd, env):
            self.proc = MockServerProcess(port, nm, cmd, env, crashed=True)
            return self.proc

        port._server_process_constructor = make_proc
        port.setup_test_run()
        self.assertEquals(port.diff_image('foo', 'bar'), ('', 0, 'ImageDiff crashed\n'))
        port.clean_up_test_run()

    def test_check_wdiff(self):
        port = self.make_port()
        port.check_wdiff()

    def integration_test_websocket_server__normal(self):
        port = self.make_port()
        self.assert_servers_are_down('localhost', self.WEBSOCKET_PORTS)
        port.start_websocket_server()
        self.assert_servers_are_up('localhost', self.WEBSOCKET_PORTS)
        port.stop_websocket_server()
        self.assert_servers_are_down('localhost', self.WEBSOCKET_PORTS)

    def integration_test_websocket_server__fails(self):
        port = self.make_port()

        # Test that start() fails if a port isn't available.
        for port_number in self.WEBSOCKET_PORTS:
            test_socket = socket.socket()
            try:
                test_socket.bind(('localhost', port_number))
                try:
                    port.start_websocket_server()
                    self.fail('should not have been able to start the server while bound to %d' % port_number)
                except http_server_base.ServerError, e:
                    pass
            finally:
                port.stop_websocket_server()
                test_socket.close()

        # Test that calling start() twice fails.
        try:
            port.start_websocket_server()
            self.assertRaises(AssertionError, port.start_websocket_server)
        finally:
            port.stop_websocket_server()

    def integration_test_websocket_server__two_servers(self):
        port = self.make_port()

        # Test that calling start() on two different ports causes the
        # first port to be treated as stale and killed.
        port.start_websocket_server()
        new_port = self.make_port()
        try:
            new_port.start_websocket_server()

            # Check that the first server was killed.
            self.assertFalse(port._executive.check_running_pid(port._websocket_server._pid))

            # Check that there is something running.
            self.assert_servers_are_up('localhost', self.WEBSOCKET_PORTS)

            # Test that calling stop() on a killed server is harmless.
            port.stop_websocket_server()
        finally:
            port.stop_websocket_server()
            new_port.stop_websocket_server()

            # Test that calling stop() twice is harmless.
            new_port.stop_websocket_server()

    def test_test_configuration(self):
        port = self.make_port()
        self.assertTrue(port.test_configuration())

    def test_all_test_configurations(self):
        port = self.make_port()
        self.assertTrue(len(port.all_test_configurations()) > 0)
        self.assertTrue(port.test_configuration() in port.all_test_configurations(), "%s not in %s" % (port.test_configuration(), port.all_test_configurations()))

    def integration_test_http_server__loop(self):
        port = self.make_port()

        i = 0
        while i < 10:
            self.assert_servers_are_down('localhost', self.HTTP_PORTS)
            port.start_http_server()

            # We sleep in between alternating runs to ensure that this
            # test handles both back-to-back starts and stops and
            # starts and stops separated by a delay.
            if i % 2:
                time.sleep(0.1)

            self.assert_servers_are_up('localhost', self.HTTP_PORTS)
            port.stop_http_server()
            if i % 2:
                time.sleep(0.1)

            i += 1

    def test_get_crash_log(self):
        port = self.make_port()
        self.assertEquals(port._get_crash_log(None, None, None, None, newer_than=None),
           (None,
            'crash log for <unknown process name> (pid <unknown>):\n'
            'STDOUT: <empty>\n'
            'STDERR: <empty>\n'))

        self.assertEquals(port._get_crash_log('foo', 1234, 'out bar\nout baz', 'err bar\nerr baz\n', newer_than=None),
            ('err bar\nerr baz\n',
             'crash log for foo (pid 1234):\n'
             'STDOUT: out bar\n'
             'STDOUT: out baz\n'
             'STDERR: err bar\n'
             'STDERR: err baz\n'))

        self.assertEquals(port._get_crash_log('foo', 1234, 'foo\xa6bar', 'foo\xa6bar', newer_than=None),
            ('foo\xa6bar',
             u'crash log for foo (pid 1234):\n'
             u'STDOUT: foo\ufffdbar\n'
             u'STDERR: foo\ufffdbar\n'))

        self.assertEquals(port._get_crash_log('foo', 1234, 'foo\xa6bar', 'foo\xa6bar', newer_than=1.0),
            ('foo\xa6bar',
             u'crash log for foo (pid 1234):\n'
             u'STDOUT: foo\ufffdbar\n'
             u'STDERR: foo\ufffdbar\n'))

    def assert_build_path(self, options, dirs, expected_path):
        port = self.make_port(options=options)
        for directory in dirs:
            port.host.filesystem.maybe_make_directory(directory)
        self.assertEquals(port._build_path(), expected_path)

    def test_expectations_ordering(self):
        port = self.make_port()
        for path in port.expectations_files():
            port._filesystem.write_text_file(path, '')
        ordered_dict = port.expectations_dict()
        self.assertEquals(port.path_to_test_expectations_file(), ordered_dict.keys()[0])

        options = MockOptions(additional_expectations=['/tmp/foo', '/tmp/bar'])
        port = self.make_port(options=options)
        for path in port.expectations_files():
            port._filesystem.write_text_file(path, '')
        port._filesystem.write_text_file('/tmp/foo', 'foo')
        port._filesystem.write_text_file('/tmp/bar', 'bar')
        ordered_dict = port.expectations_dict()
        self.assertEquals(ordered_dict.keys()[-2:], options.additional_expectations)
        self.assertEquals(ordered_dict.values()[-2:], ['foo', 'bar'])

    def test_path_to_test_expectations_file(self):
        port = TestWebKitPort()
        port._options = MockOptions(webkit_test_runner=False)
        self.assertEqual(port.path_to_test_expectations_file(), '/mock-checkout/LayoutTests/platform/testwebkitport/TestExpectations')

        port = TestWebKitPort()
        port._options = MockOptions(webkit_test_runner=True)
        self.assertEqual(port.path_to_test_expectations_file(), '/mock-checkout/LayoutTests/platform/testwebkitport/TestExpectations')

        port = TestWebKitPort()
        port.host.filesystem.files['/mock-checkout/LayoutTests/platform/testwebkitport/TestExpectations'] = 'some content'
        port._options = MockOptions(webkit_test_runner=False)
        self.assertEqual(port.path_to_test_expectations_file(), '/mock-checkout/LayoutTests/platform/testwebkitport/TestExpectations')

    def test_skipped_directories_for_symbols(self):
        # This first test confirms that the commonly found symbols result in the expected skipped directories.
        symbols_string = " ".join(["GraphicsLayer", "WebCoreHas3DRendering", "isXHTMLMPDocument", "fooSymbol"])
        expected_directories = set([
            "mathml",  # Requires MathMLElement
            "fast/canvas/webgl",  # Requires WebGLShader
            "compositing/webgl",  # Requires WebGLShader
            "http/tests/canvas/webgl",  # Requires WebGLShader
            "mhtml",  # Requires MHTMLArchive
            "fast/css/variables",  # Requires CSS Variables
            "inspector/styles/variables",  # Requires CSS Variables
        ])

        result_directories = set(TestWebKitPort(symbols_string, None)._skipped_tests_for_unsupported_features(test_list=['mathml/foo.html']))
        self.assertEqual(result_directories, expected_directories)

        # Test that the nm string parsing actually works:
        symbols_string = """
000000000124f498 s __ZZN7WebCore13GraphicsLayer12replaceChildEPS0_S1_E19__PRETTY_FUNCTION__
000000000124f500 s __ZZN7WebCore13GraphicsLayer13addChildAboveEPS0_S1_E19__PRETTY_FUNCTION__
000000000124f670 s __ZZN7WebCore13GraphicsLayer13addChildBelowEPS0_S1_E19__PRETTY_FUNCTION__
"""
        # Note 'compositing' is not in the list of skipped directories (hence the parsing of GraphicsLayer worked):
        expected_directories = set(['mathml', 'transforms/3d', 'compositing/webgl', 'fast/canvas/webgl', 'animations/3d', 'mhtml', 'http/tests/canvas/webgl', 'fast/css/variables', 'inspector/styles/variables'])
        result_directories = set(TestWebKitPort(symbols_string, None)._skipped_tests_for_unsupported_features(test_list=['mathml/foo.html']))
        self.assertEqual(result_directories, expected_directories)

    def test_skipped_directories_for_features(self):
        supported_features = ["Accelerated Compositing", "Foo Feature"]
        expected_directories = set(["animations/3d", "transforms/3d"])
        port = TestWebKitPort(None, supported_features)
        port._runtime_feature_list = lambda: supported_features
        result_directories = set(port._skipped_tests_for_unsupported_features(test_list=["animations/3d/foo.html"]))
        self.assertEqual(result_directories, expected_directories)

    def test_skipped_directories_for_features_no_matching_tests_in_test_list(self):
        supported_features = ["Accelerated Compositing", "Foo Feature"]
        expected_directories = set([])
        result_directories = set(TestWebKitPort(None, supported_features)._skipped_tests_for_unsupported_features(test_list=['foo.html']))
        self.assertEqual(result_directories, expected_directories)

    def test_skipped_tests_for_unsupported_features_empty_test_list(self):
        supported_features = ["Accelerated Compositing", "Foo Feature"]
        expected_directories = set([])
        result_directories = set(TestWebKitPort(None, supported_features)._skipped_tests_for_unsupported_features(test_list=None))
        self.assertEqual(result_directories, expected_directories)

    def test_skipped_layout_tests(self):
        self.assertEqual(TestWebKitPort(None, None).skipped_layout_tests(test_list=[]), set(['media']))

    def test_expectations_files(self):
        port = TestWebKitPort()

        def platform_dirs(port):
            return [port.host.filesystem.basename(port.host.filesystem.dirname(f)) for f in port.expectations_files()]

        self.assertEqual(platform_dirs(port), ['testwebkitport'])

        port._name = "testwebkitport-version"
        self.assertEqual(platform_dirs(port), ['testwebkitport', 'testwebkitport-version'])

        port._options = MockOptions(webkit_test_runner=True)
        self.assertEqual(platform_dirs(port), ['testwebkitport', 'testwebkitport-version', 'testwebkitport-wk2', 'wk2'])

        port._options = MockOptions(additional_platform_directory=["internal-testwebkitport"])
        self.assertEqual(platform_dirs(port), ['testwebkitport', 'testwebkitport-version', 'internal-testwebkitport'])

    def test_root_option(self):
        port = TestWebKitPort()
        port._options = MockOptions(root='/foo')
        self.assertEqual(port._path_to_driver(), "/foo/DumpRenderTree")

    def test_test_expectations(self):
        # Check that we read the expectations file
        host = MockSystemHost()
        host.filesystem.write_text_file('/mock-checkout/LayoutTests/platform/testwebkitport/TestExpectations',
            'BUG_TESTEXPECTATIONS SKIP : fast/html/article-element.html = FAIL\n')
        port = TestWebKitPort(host=host)
        self.assertEqual(''.join(port.expectations_dict().values()), 'BUG_TESTEXPECTATIONS SKIP : fast/html/article-element.html = FAIL\n')

    def test_build_driver(self):
        output = OutputCapture()
        port = TestWebKitPort()
        # Delay setting _executive to avoid logging during construction
        port._executive = MockExecutive(should_log=True)
        port._options = MockOptions(configuration="Release")  # This should not be necessary, but I think TestWebKitPort is actually reading from disk (and thus detects the current configuration).
        expected_stderr = "MOCK run_command: ['Tools/Scripts/build-dumprendertree', '--release'], cwd=/mock-checkout, env={'LC_ALL': 'C', 'MOCK_ENVIRON_COPY': '1'}\n"
        self.assertTrue(output.assert_outputs(self, port._build_driver, expected_stderr=expected_stderr, expected_logs=''))

        # Make sure when passed --webkit-test-runner we build the right tool.
        port._options = MockOptions(webkit_test_runner=True, configuration="Release")
        expected_stderr = "MOCK run_command: ['Tools/Scripts/build-dumprendertree', '--release'], cwd=/mock-checkout, env={'LC_ALL': 'C', 'MOCK_ENVIRON_COPY': '1'}\nMOCK run_command: ['Tools/Scripts/build-webkittestrunner', '--release'], cwd=/mock-checkout, env={'LC_ALL': 'C', 'MOCK_ENVIRON_COPY': '1'}\n"
        self.assertTrue(output.assert_outputs(self, port._build_driver, expected_stderr=expected_stderr, expected_logs=''))

        # Make sure we show the build log when --verbose is passed, which we simulate by setting the logging level to DEBUG.
        output.set_log_level(logging.DEBUG)
        port._options = MockOptions(configuration="Release")
        expected_stderr = "MOCK run_command: ['Tools/Scripts/build-dumprendertree', '--release'], cwd=/mock-checkout, env={'LC_ALL': 'C', 'MOCK_ENVIRON_COPY': '1'}\n"
        expected_logs = "Output of ['Tools/Scripts/build-dumprendertree', '--release']:\nMOCK output of child process\n"
        self.assertTrue(output.assert_outputs(self, port._build_driver, expected_stderr=expected_stderr, expected_logs=expected_logs))
        output.set_log_level(logging.INFO)

        # Make sure that failure to build returns False.
        port._executive = MockExecutive(should_log=True, should_throw=True)
        # Because WK2 currently has to build both webkittestrunner and DRT, if DRT fails, that's the only one it tries.
        expected_stderr = "MOCK run_command: ['Tools/Scripts/build-dumprendertree', '--release'], cwd=/mock-checkout, env={'LC_ALL': 'C', 'MOCK_ENVIRON_COPY': '1'}\n"
        expected_logs = "MOCK ScriptError\n\nMOCK output of child process\n"
        self.assertFalse(output.assert_outputs(self, port._build_driver, expected_stderr=expected_stderr, expected_logs=expected_logs))

    def _assert_config_file_for_platform(self, port, platform, config_file):
        self.assertEquals(port._apache_config_file_name_for_platform(platform), config_file)

    def test_linux_distro_detection(self):
        port = TestWebKitPort()
        self.assertFalse(port._is_redhat_based())
        self.assertFalse(port._is_debian_based())

        port._filesystem = MockFileSystem({'/etc/redhat-release': ''})
        self.assertTrue(port._is_redhat_based())
        self.assertFalse(port._is_debian_based())

        port._filesystem = MockFileSystem({'/etc/debian_version': ''})
        self.assertFalse(port._is_redhat_based())
        self.assertTrue(port._is_debian_based())

    def test_apache_config_file_name_for_platform(self):
        port = TestWebKitPort()
        self._assert_config_file_for_platform(port, 'cygwin', 'cygwin-httpd.conf')

        self._assert_config_file_for_platform(port, 'linux2', 'apache2-httpd.conf')
        self._assert_config_file_for_platform(port, 'linux3', 'apache2-httpd.conf')

        port._is_redhat_based = lambda: True
        self._assert_config_file_for_platform(port, 'linux2', 'fedora-httpd.conf')

        port = TestWebKitPort()
        port._is_debian_based = lambda: True
        self._assert_config_file_for_platform(port, 'linux2', 'apache2-debian-httpd.conf')

        self._assert_config_file_for_platform(port, 'mac', 'apache2-httpd.conf')
        self._assert_config_file_for_platform(port, 'win32', 'apache2-httpd.conf')  # win32 isn't a supported sys.platform.  AppleWin/WinCairo/WinCE ports all use cygwin.
        self._assert_config_file_for_platform(port, 'barf', 'apache2-httpd.conf')

    def test_path_to_apache_config_file(self):
        port = TestWebKitPort()

        saved_environ = os.environ.copy()
        try:
            os.environ['WEBKIT_HTTP_SERVER_CONF_PATH'] = '/path/to/httpd.conf'
            self.assertRaises(IOError, port._path_to_apache_config_file)
            port._filesystem.write_text_file('/existing/httpd.conf', 'Hello, world!')
            os.environ['WEBKIT_HTTP_SERVER_CONF_PATH'] = '/existing/httpd.conf'
            self.assertEquals(port._path_to_apache_config_file(), '/existing/httpd.conf')
        finally:
            os.environ = saved_environ.copy()

        # Mock out _apache_config_file_name_for_platform to ignore the passed sys.platform value.
        port._apache_config_file_name_for_platform = lambda platform: 'httpd.conf'
        self.assertEquals(port._path_to_apache_config_file(), '/mock-checkout/LayoutTests/http/conf/httpd.conf')

        # Check that even if we mock out _apache_config_file_name, the environment variable takes precedence.
        saved_environ = os.environ.copy()
        try:
            os.environ['WEBKIT_HTTP_SERVER_CONF_PATH'] = '/existing/httpd.conf'
            self.assertEquals(port._path_to_apache_config_file(), '/existing/httpd.conf')
        finally:
            os.environ = saved_environ.copy()

    def test_check_build(self):
        port = self.make_port(options=MockOptions(build=True))
        self.build_called = False

        def build_driver_called():
            self.build_called = True
            return True

        port._build_driver = build_driver_called
        port.check_build(False)
        self.assertTrue(self.build_called)

        port = self.make_port(options=MockOptions(root='/tmp', build=True))
        self.build_called = False
        port._build_driver = build_driver_called
        port.check_build(False)
        self.assertFalse(self.build_called, None)

        port = self.make_port(options=MockOptions(build=False))
        self.build_called = False
        port._build_driver = build_driver_called
        port.check_build(False)
        self.assertFalse(self.build_called, None)

    def test_additional_platform_directory(self):
        port = self.make_port(options=MockOptions(additional_platform_directory=['/tmp/foo']))
        self.assertEquals(port.baseline_search_path()[0], '/tmp/foo')