def collect_tasks(self, test, tasks_queue, tasks_list, to_teardown, result):
        """
        Recursively traverses the test suite tree and either records
        Failure results directly, or recurses into self.collect for
        test suite members that share common fixtures, or adds task
        to the global queue.

        :param test: Test or a collection of test (Test suite)
        :param tasks_queue: List of tuples (task_addr, args)
        :type tasks_queue: list
        :param tasks_list: List of task names task_addr + str(args)
        :type tasks_list: list
        :param to_teardown: List object to be populated with objects to tear down
        :type to_teardown: list
        :param result:
        :type result: TextTestResult
        """

        # Dispatch and collect results
        # It puts indexes only on queue because tests aren't picklable

        self.stream.write("Inspecting test tree for distributable tests...")

        for case in self.get_test_batch(test):
            self.stream.write(".")

            if (isinstance(case, nose.case.Test) and
                isinstance(case.test, failure.Failure)):
                case(result) # run here to capture the failure
                continue

            # handle shared fixtures
            if isinstance(case, ContextSuite) and case.context is failure.Failure:
                case(result) # run here to capture the failure
                continue

            if isinstance(case, ContextSuite) and has_shared_fixtures(case):
                try:
                    case.setUp()
                except (KeyboardInterrupt, SystemExit):
                    raise
                except:
                    result.addError(case, sys.exc_info())
                else:
                    to_teardown.append(case)
                    if case.factory:
                        ancestors = case.factory.context.get(case, [])
                        for ancestor in ancestors[:2]:
                            if getattr(ancestor, '_multiprocess_shared_', False):
                                ancestor._multiprocess_can_split_ = True
                            #ancestor._multiprocess_shared_ = False
                    self.collect_tasks(case, tasks_queue, tasks_list, to_teardown, result)
                continue

            # task_addr is the exact string that was put in tasks_list
            test_addr = add_task_to_queue(case, tasks_queue, tasks_list)
            log.debug("Queued test %s (%s)", len(tasks_list), test_addr)

        self.stream.write(" Found %s test cases\n" % len(tasks_queue))

    def test_function_test_case(self):
        res = unittest.TestResult()
        
        a = []
        def func(a=a):
            a.append(1)

        case = nose.case.FunctionTestCase(func)
        case(res)
        assert a[0] == 1

    def test_result_proxy_used(self):
        """A result proxy is used to wrap the result for all tests"""
        class TC(unittest.TestCase):
            def runTest(self):
                raise Exception("error")
            
        ResultProxy.called[:] = []
        res = unittest.TestResult()
        config = Config()
        case = nose.case.Test(TC(), config=config,
                              resultProxy=ResultProxyFactory())

        case(res)
        assert not res.errors, res.errors
        assert not res.failures, res.failures

        calls = [ c[0] for c in ResultProxy.called ]
        self.assertEqual(calls, ['beforeTest', 'startTest', 'addError',
                                 'stopTest', 'afterTest'])

    def test_function_test_case_fixtures(self):
        from nose.tools import with_setup
        res = unittest.TestResult()

        called = {}

        def st():
            called['st'] = True
        def td():
            called['td'] = True

        def func_exc():
            called['func'] = True
            raise TypeError("An exception")

        func_exc = with_setup(st, td)(func_exc)
        case = nose.case.FunctionTestCase(func_exc)
        case(res)
        assert 'st' in called
        assert 'func' in called
        assert 'td' in called

    def test_case_fixtures_called(self):
        """Instance fixtures are properly called for wrapped tests"""
        res = unittest.TestResult()
        called = []
                        
        class TC(unittest.TestCase):
            def setUp(self):
                print "TC setUp %s" % self
                called.append('setUp')
            def runTest(self):
                print "TC runTest %s" % self
                called.append('runTest')
            def tearDown(self):
                print "TC tearDown %s" % self
                called.append('tearDown')

        case = nose.case.Test(TC())
        case(res)
        assert not res.errors, res.errors
        assert not res.failures, res.failures
        self.assertEqual(called, ['setUp', 'runTest', 'tearDown'])

    def collect(self, test, testQueue, tasks, to_teardown, result):
        # dispatch and collect results
        # put indexes only on queue because tests aren't picklable
        for case in self.nextBatch(test):
            log.debug("Next batch %s (%s)", case, type(case))
            if (isinstance(case, nose.case.Test) and
                isinstance(case.test, failure.Failure)):
                log.debug("Case is a Failure")
                case(result) # run here to capture the failure
                continue
            # handle shared fixtures
            if isinstance(case, ContextSuite) and case.context is failure.Failure:
                log.debug("Case is a Failure")
                case(result) # run here to capture the failure
                continue
            elif isinstance(case, ContextSuite) and self.sharedFixtures(case):
                log.debug("%s has shared fixtures", case)
                try:
                    case.setUp()
                except (KeyboardInterrupt, SystemExit):
                    raise
                except:
                    log.debug("%s setup failed", sys.exc_info())
                    result.addError(case, sys.exc_info())
                else:
                    to_teardown.append(case)
                    if case.factory:
                        ancestors=case.factory.context.get(case, [])
                        for an in ancestors[:2]:
                            #log.debug('reset ancestor %s', an)
                            if getattr(an, '_multiprocess_shared_', False):
                                an._multiprocess_can_split_=True
                            #an._multiprocess_shared_=False
                    self.collect(case, testQueue, tasks, to_teardown, result)

            else:
                test_addr = self.addtask(testQueue,tasks,case)
                log.debug("Queued test %s (%s) to %s",
                          len(tasks), test_addr, testQueue)

    def run(self, test):
        """
        Execute the test (which may be a test suite). If the test is a suite,
        distribute it out among as many processes as have been configured, at
        as fine a level as is possible given the context fixtures defined in
        the suite or any sub-suites.

        """
        log.debug("%s.run(%s) (%s)", self, test, os.getpid())
        wrapper = self.config.plugins.prepareTest(test)
        if wrapper is not None:
            test = wrapper

        # plugins can decorate or capture the output stream
        wrapped = self.config.plugins.setOutputStream(self.stream)
        if wrapped is not None:
            self.stream = wrapped

        testQueue = Queue()
        resultQueue = Queue()
        tasks = []
        completed = []
        workers = []
        to_teardown = []
        shouldStop = Event()

        result = self._makeResult()
        start = time.time()

        # dispatch and collect results
        # put indexes only on queue because tests aren't picklable
        for case in self.nextBatch(test):
            log.debug("Next batch %s (%s)", case, type(case))
            if isinstance(case, nose.case.Test) and isinstance(case.test, failure.Failure):
                log.debug("Case is a Failure")
                case(result)  # run here to capture the failure
                continue
            # handle shared fixtures
            if isinstance(case, ContextSuite) and case.context is failure.Failure:
                log.debug("Case is a Failure")
                case(result)  # run here to capture the failure
                continue
            elif isinstance(case, ContextSuite) and self.sharedFixtures(case):
                log.debug("%s has shared fixtures", case)
                try:
                    case.setUp()
                except (KeyboardInterrupt, SystemExit):
                    raise
                except:
                    log.debug("%s setup failed", sys.exc_info())
                    result.addError(case, sys.exc_info())
                else:
                    to_teardown.append(case)
                    for _t in case:
                        test_addr = self.addtask(testQueue, tasks, _t)
                        log.debug("Queued shared-fixture test %s (%s) to %s", len(tasks), test_addr, testQueue)
            else:
                test_addr = self.addtask(testQueue, tasks, case)
                log.debug("Queued test %s (%s) to %s", len(tasks), test_addr, testQueue)

        log.debug("Starting %s workers", self.config.multiprocess_workers)
        for i in range(self.config.multiprocess_workers):
            currentaddr = Array("c", 1000)
            currentaddr.value = bytes_("")
            currentstart = Value("d")
            keyboardCaught = Event()
            p = Process(
                target=runner,
                args=(
                    i,
                    testQueue,
                    resultQueue,
                    currentaddr,
                    currentstart,
                    keyboardCaught,
                    shouldStop,
                    self.loaderClass,
                    result.__class__,
                    pickle.dumps(self.config),
                ),
            )
            p.currentaddr = currentaddr
            p.currentstart = currentstart
            p.keyboardCaught = keyboardCaught
            # p.setDaemon(True)
            p.start()
            workers.append(p)
            log.debug("Started worker process %s", i + 1)

        total_tasks = len(tasks)
        # need to keep track of the next time to check for timeouts in case
        # more than one process times out at the same time.
        nexttimeout = self.config.multiprocess_timeout
        while tasks:
            log.debug("Waiting for results (%s/%s tasks), next timeout=%.3fs", len(completed), total_tasks, nexttimeout)
            try:
                iworker, addr, newtask_addrs, batch_result = resultQueue.get(timeout=nexttimeout)
                log.debug("Results received for worker %d, %s, new tasks: %d", iworker, addr, len(newtask_addrs))
                try:
                    try:
#.........这里部分代码省略.........

    def run(self, test):
        """
        Execute the test (which may be a test suite). If the test is a suite,
        distribute it out among as many processes as have been configured, at
        as fine a level as is possible given the context fixtures defined in the
        suite or any sub-suites.

        """
        log.debug("%s.run(%s) (%s)", self, test, os.getpid())
        wrapper = self.config.plugins.prepareTest(test)
        if wrapper is not None:
            test = wrapper

        # plugins can decorate or capture the output stream
        wrapped = self.config.plugins.setOutputStream(self.stream)
        if wrapped is not None:
            self.stream = wrapped

        testQueue = Queue()
        resultQueue = Queue()
        tasks = {}
        completed = {}
        workers = []
        to_teardown = []
        shouldStop = Event()

        result = self._makeResult()
        start = time.time()

        # dispatch and collect results
        # put indexes only on queue because tests aren't picklable
        for case in self.nextBatch(test):
            log.debug("Next batch %s (%s)", case, type(case))
            if (isinstance(case, nose.case.Test) and
                isinstance(case.test, failure.Failure)):
                log.debug("Case is a Failure")
                case(result) # run here to capture the failure
                continue
            # handle shared fixtures
            if isinstance(case, ContextSuite) and self.sharedFixtures(case):
                log.debug("%s has shared fixtures", case)
                try:
                    case.setUp()
                except (KeyboardInterrupt, SystemExit):
                    raise
                except:
                    log.debug("%s setup failed", sys.exc_info())
                    result.addError(case, sys.exc_info())
                else:
                    to_teardown.append(case)
                    for _t in case:
                        test_addr = self.address(_t)
                        testQueue.put(test_addr, block=False)
                        tasks[test_addr] = None
                        log.debug("Queued shared-fixture test %s (%s) to %s",
                                  len(tasks), test_addr, testQueue)

            else:
                test_addr = self.address(case)
                testQueue.put(test_addr, block=False)
                tasks[test_addr] = None
                log.debug("Queued test %s (%s) to %s",
                          len(tasks), test_addr, testQueue)

        log.debug("Starting %s workers", self.config.multiprocess_workers)
        for i in range(self.config.multiprocess_workers):
            p = Process(target=runner, args=(i,
                                             testQueue,
                                             resultQueue,
                                             shouldStop,
                                             self.loaderClass,
                                             result.__class__,
                                             pickle.dumps(self.config)))
            # p.setDaemon(True)
            p.start()
            workers.append(p)
            log.debug("Started worker process %s", i+1)

        num_tasks = len(tasks)
        while tasks:
            log.debug("Waiting for results (%s/%s tasks)",
                      len(completed), num_tasks)
            try:
                addr, batch_result = resultQueue.get(
                    timeout=self.config.multiprocess_timeout)
                log.debug('Results received for %s', addr)
                try:
                    tasks.pop(addr)
                except KeyError:
                    log.debug("Got result for unknown task? %s", addr)
                else:
                    completed[addr] = batch_result
                self.consolidate(result, batch_result)
                if (self.config.stopOnError
                    and not result.wasSuccessful()):
                    # set the stop condition
                    shouldStop.set()
                    break
            except Empty:
                log.debug("Timed out with %s tasks pending", len(tasks))
#.........这里部分代码省略.........