def delete(self, request):
        if not request.user.has_perm('experiments.delete_experiment'):
            raise ExperimentException("You don't have permission to do that!")
        experiment_counter = ExperimentCounter()
        experiment = Experiment.objects.get(name=request.POST.get("name"))

        experiment.enrollment_set.all().delete()
        experiment_counter.delete(experiment)
        experiment.delete()
        return {'successful': True}

    def setUp(self):
        self.experiment = Experiment.objects.create(name=EXPERIMENT_NAME, state=ENABLED_STATE)
        self.experiment_counter = ExperimentCounter()

        User = get_user_model()
        self.user = User.objects.create(username='incorporate_user')
        self.user.is_confirmed_human = True

        request_factory = RequestFactory()
        self.request = request_factory.get('/')
        self.request.session = DatabaseSession()
        participant(self.request).confirm_human()

class WebUserIncorporateTestCase(object):
    def __init__(self, *args, **kwargs):
        super(WebUserIncorporateTestCase, self).__init__(*args, **kwargs)
        self.experiment_counter = ExperimentCounter()

    def test_can_incorporate(self):
        self.incorporating.incorporate(self.incorporated)

    def test_incorporates_enrollment_from_other(self):
        if not self._has_data():
            return

        try:
            experiment = Experiment.objects.create(name=EXPERIMENT_NAME, state=ENABLED_STATE)
            self.incorporated.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)
            self.incorporating.incorporate(self.incorporated)
            self.assertEqual(self.incorporating.get_alternative(EXPERIMENT_NAME), TEST_ALTERNATIVE)
        finally:
            self.experiment_counter.delete(experiment)

    def _has_data(self):
        return not isinstance(self.incorporated, DummyUser) and not isinstance(self.incorporating, DummyUser)

class ParticipantCacheTestCase(TestCase):
    def setUp(self):
        self.experiment = Experiment.objects.create(name='test_experiment1', state=ENABLED_STATE)
        self.experiment_counter = ExperimentCounter()

    def tearDown(self):
        self.experiment_counter.delete(self.experiment)

    def test_transfer_enrollments(self):
        User = get_user_model()
        user = User.objects.create(username='test')
        request = request_factory.get('/')
        request.session = DatabaseSession()
        participant(request).enroll('test_experiment1', ['alternative'])
        request.user = user
        transfer_enrollments_to_user(None, request, user)
        # the call to the middleware will set last_seen on the experiment
        # if the participant cache hasn't been wiped appropriately then the
        # session experiment user will be impacted instead of the authenticated
        # experiment user
        ExperimentsRetentionMiddleware().process_response(request, HttpResponse())
        self.assertIsNotNone(Enrollment.objects.all()[0].last_seen)

class BotTests(object):
    def setUp(self):
        self.experiment = Experiment(name='backgroundcolor', state=ENABLED_STATE)
        self.experiment.save()
        self.experiment_counter = ExperimentCounter()

    def test_user_does_not_enroll(self):
        self.experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, TEST_ALTERNATIVE), 0, "Bot counted towards results")

    def test_user_does_not_fire_goals(self):
        self.experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)
        self.experiment_user.goal(TEST_GOAL)
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, TEST_ALTERNATIVE), 0, "Bot counted towards results")

    def test_bot_in_control_group(self):
        self.experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)
        self.assertEqual(self.experiment_user.get_alternative(EXPERIMENT_NAME), 'control', "Bot enrolled in a group")
        self.assertEqual(self.experiment_user.is_enrolled(self.experiment.name, TEST_ALTERNATIVE), False, "Bot in test alternative")
        self.assertEqual(self.experiment_user.is_enrolled(self.experiment.name, CONTROL_GROUP), True, "Bot not in control group")

    def tearDown(self):
        self.experiment_counter.delete(self.experiment)

class IncorporateTestCase(TestCase):
    def setUp(self):
        self.experiment = Experiment.objects.create(name=EXPERIMENT_NAME, state=ENABLED_STATE)
        self.experiment_counter = ExperimentCounter()

        User = get_user_model()
        self.user = User.objects.create(username='incorporate_user')
        self.user.is_confirmed_human = True

        request_factory = RequestFactory()
        self.request = request_factory.get('/')
        self.request.session = DatabaseSession()
        participant(self.request).confirm_human()

    def tearDown(self):
        self.experiment_counter.delete(self.experiment)

    def _login(self):
        self.request.user = self.user
        transfer_enrollments_to_user(None, self.request, self.user)

    def test_visit_incorporate(self):
        alternative = participant(self.request).enroll(self.experiment.name, ['alternative'])

        ExperimentsRetentionMiddleware().process_response(self.request, HttpResponse())

        self.assertEqual(
            dict(self.experiment_counter.participant_goal_frequencies(self.experiment,
                                                                      alternative,
                                                                      participant(self.request)._participant_identifier()))[conf.VISIT_NOT_PRESENT_COUNT_GOAL],
            1
        )

        self.assertFalse(Enrollment.objects.all().exists())
        self._login()

        self.assertTrue(Enrollment.objects.all().exists())
        self.assertIsNotNone(Enrollment.objects.all()[0].last_seen)
        self.assertEqual(
            dict(self.experiment_counter.participant_goal_frequencies(self.experiment,
                                                                      alternative,
                                                                      participant(self.request)._participant_identifier()))[conf.VISIT_NOT_PRESENT_COUNT_GOAL],
            1
        )
        self.assertEqual(self.experiment_counter.goal_count(self.experiment, alternative, conf.VISIT_NOT_PRESENT_COUNT_GOAL), 1)
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, alternative), 1)

 def __init__(self, *args, **kwargs):
     super(WebUserIncorporateTestCase, self).__init__(*args, **kwargs)
     self.experiment_counter = ExperimentCounter()

 def setUp(self):
     self.experiment = Experiment(name=EXPERIMENT_NAME, state=ENABLED_STATE)
     self.experiment.save()
     self.request = request_factory.get('/')
     self.request.session = DatabaseSession()
     self.experiment_counter = ExperimentCounter()

class WebUserTests(object):
    def setUp(self):
        self.experiment = Experiment(name=EXPERIMENT_NAME, state=ENABLED_STATE)
        self.experiment.save()
        self.request = request_factory.get('/')
        self.request.session = DatabaseSession()
        self.experiment_counter = ExperimentCounter()

    def tearDown(self):
        self.experiment_counter.delete(self.experiment)

    def test_enrollment_initially_control(self):
        experiment_user = participant(self.request)
        self.assertEqual(experiment_user.get_alternative(EXPERIMENT_NAME), 'control', "Default Enrollment wasn't control")

    def test_user_enrolls(self):
        experiment_user = participant(self.request)
        experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)
        self.assertEqual(experiment_user.get_alternative(EXPERIMENT_NAME), TEST_ALTERNATIVE, "Wrong Alternative Set")

    def test_record_goal_increments_counts(self):
        experiment_user = participant(self.request)
        experiment_user.confirm_human()
        experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)

        self.assertEqual(self.experiment_counter.goal_count(self.experiment, TEST_ALTERNATIVE, TEST_GOAL), 0)
        experiment_user.goal(TEST_GOAL)
        self.assertEqual(self.experiment_counter.goal_count(self.experiment, TEST_ALTERNATIVE, TEST_GOAL), 1, "Did not increment Goal count")

    def test_can_record_goal_multiple_times(self):
        experiment_user = participant(self.request)
        experiment_user.confirm_human()
        experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)

        experiment_user.goal(TEST_GOAL)
        experiment_user.goal(TEST_GOAL)
        experiment_user.goal(TEST_GOAL)
        self.assertEqual(self.experiment_counter.goal_count(self.experiment, TEST_ALTERNATIVE, TEST_GOAL), 1, "Did not increment goal count correctly")
        self.assertEqual(self.experiment_counter.goal_distribution(self.experiment, TEST_ALTERNATIVE, TEST_GOAL), {3: 1}, "Incorrect goal count distribution")

    def test_counts_increment_immediately_once_confirmed_human(self):
        experiment_user = participant(self.request)
        experiment_user.confirm_human()

        experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, TEST_ALTERNATIVE), 1, "Did not count participant after confirm human")

    def test_visit_increases_goal(self):
        thetime = timezone.now()
        with patch('experiments.utils.now', return_value=thetime):
            experiment_user = participant(self.request)
            experiment_user.confirm_human()
            experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)

            experiment_user.visit()
            self.assertEqual(self.experiment_counter.goal_distribution(self.experiment, TEST_ALTERNATIVE, VISIT_NOT_PRESENT_COUNT_GOAL), {1: 1}, "Not Present Visit was not correctly counted")
            self.assertEqual(self.experiment_counter.goal_distribution(self.experiment, TEST_ALTERNATIVE, VISIT_PRESENT_COUNT_GOAL), {}, "Present Visit was not correctly counted")

        with patch('experiments.utils.now', return_value=thetime + timedelta(hours=7)):
            experiment_user.visit()
            self.assertEqual(self.experiment_counter.goal_distribution(self.experiment, TEST_ALTERNATIVE, VISIT_NOT_PRESENT_COUNT_GOAL), {2: 1}, "No Present Visit was not correctly counted")
            self.assertEqual(self.experiment_counter.goal_distribution(self.experiment, TEST_ALTERNATIVE, VISIT_PRESENT_COUNT_GOAL), {1: 1}, "Present Visit was not correctly counted")

    def test_visit_twice_increases_once(self):
        experiment_user = participant(self.request)
        experiment_user.confirm_human()
        experiment_user.set_alternative(EXPERIMENT_NAME, TEST_ALTERNATIVE)

        experiment_user.visit()
        experiment_user.visit()

        self.assertEqual(self.experiment_counter.goal_distribution(self.experiment, TEST_ALTERNATIVE, VISIT_NOT_PRESENT_COUNT_GOAL), {1: 1}, "Visit was not correctly counted")
        self.assertEqual(self.experiment_counter.goal_distribution(self.experiment, TEST_ALTERNATIVE, VISIT_PRESENT_COUNT_GOAL), {}, "Present Visit was not correctly counted")

    def test_user_force_enrolls(self):
        experiment_user = participant(self.request)
        experiment_user.enroll(EXPERIMENT_NAME, ['control', 'alternative1', 'alternative2'], force_alternative='alternative2')
        self.assertEqual(experiment_user.get_alternative(EXPERIMENT_NAME), 'alternative2')

    def test_user_does_not_force_enroll_to_new_alternative(self):
        alternatives = ['control', 'alternative1', 'alternative2']
        experiment_user = participant(self.request)
        experiment_user.enroll(EXPERIMENT_NAME, alternatives)
        alternative = experiment_user.get_alternative(EXPERIMENT_NAME)
        self.assertIsNotNone(alternative)

        other_alternative = random.choice(list(set(alternatives) - set(alternative)))
        experiment_user.enroll(EXPERIMENT_NAME, alternatives, force_alternative=other_alternative)
        self.assertEqual(alternative, experiment_user.get_alternative(EXPERIMENT_NAME))

    def test_second_force_enroll_does_not_change_alternative(self):
        alternatives = ['control', 'alternative1', 'alternative2']
        experiment_user = participant(self.request)
        experiment_user.enroll(EXPERIMENT_NAME, alternatives, force_alternative='alternative1')
        alternative = experiment_user.get_alternative(EXPERIMENT_NAME)
        self.assertIsNotNone(alternative)

        other_alternative = random.choice(list(set(alternatives) - set(alternative)))
        experiment_user.enroll(EXPERIMENT_NAME, alternatives, force_alternative=other_alternative)
        self.assertEqual(alternative, experiment_user.get_alternative(EXPERIMENT_NAME))

class WebUser(object):
    """Represents a user (either authenticated or session based) which can take part in experiments"""

    def __init__(self):
        self.experiment_counter = ExperimentCounter()

    def enroll(self, experiment_name, alternatives, force_alternative=None):
        """
        Enroll this user in the experiment if they are not already part of it. Returns the selected alternative

        force_alternative: Optionally force a user in an alternative at enrollment time
        """
        chosen_alternative = conf.CONTROL_GROUP

        experiment = experiment_manager.get(experiment_name, None)
        if experiment and experiment.is_displaying_alternatives():
            if isinstance(alternatives, collections.Mapping):
                if conf.CONTROL_GROUP not in alternatives:
                    experiment.ensure_alternative_exists(conf.CONTROL_GROUP, 1)
                for alternative, weight in alternatives.items():
                    experiment.ensure_alternative_exists(alternative, weight)
            else:
                alternatives_including_control = alternatives + [conf.CONTROL_GROUP]
                for alternative in alternatives_including_control:
                    experiment.ensure_alternative_exists(alternative)

            assigned_alternative = self._get_enrollment(experiment)
            if assigned_alternative:
                chosen_alternative = assigned_alternative
            elif experiment.is_accepting_new_users():
                if force_alternative:
                    chosen_alternative = force_alternative
                else:
                    chosen_alternative = experiment.random_alternative()
                self._set_enrollment(experiment, chosen_alternative)

        return chosen_alternative

    def get_alternative(self, experiment_name):
        """Get the alternative this user is enrolled in. If not enrolled in the experiment returns 'control'"""
        experiment = experiment_manager.get(experiment_name, None)
        if experiment and experiment.is_displaying_alternatives():
            alternative = self._get_enrollment(experiment)
            if alternative is not None:
                return alternative
        return "control"

    def set_alternative(self, experiment_name, alternative):
        """Explicitly set the alternative the user is enrolled in for the specified experiment.

        This allows you to change a user between alternatives. The user and goal counts for the new
        alternative will be increment, but those for the old one will not be decremented. The user will
        be enrolled in the experiment even if the experiment would not normally accept this user."""
        experiment = experiment_manager.get(experiment_name, None)
        if experiment:
            self._set_enrollment(experiment, alternative)

    def goal(self, goal_name, count=1):
        """Record that this user has performed a particular goal

        This will update the goal stats for all experiments the user is enrolled in."""
        for enrollment in self._get_all_enrollments():
            if enrollment.experiment.is_displaying_alternatives():
                self._experiment_goal(enrollment.experiment, enrollment.alternative, goal_name, count)

    def confirm_human(self):
        """Mark that this is a real human being (not a bot) and thus results should be counted"""
        pass

    def incorporate(self, other_user):
        """Incorporate all enrollments and goals performed by the other user

        If this user is not enrolled in a given experiment, the results for the
        other user are incorporated. For experiments this user is already
        enrolled in the results of the other user are discarded.

        This takes a relatively large amount of time for each experiment the other
        user is enrolled in."""
        for enrollment in other_user._get_all_enrollments():
            if not self._get_enrollment(enrollment.experiment):
                self._set_enrollment(
                    enrollment.experiment, enrollment.alternative, enrollment.enrollment_date, enrollment.last_seen
                )
                goals = self.experiment_counter.participant_goal_frequencies(
                    enrollment.experiment, enrollment.alternative, other_user._participant_identifier()
                )
                for goal_name, count in goals:
                    self.experiment_counter.increment_goal_count(
                        enrollment.experiment, enrollment.alternative, goal_name, self._participant_identifier(), count
                    )
            other_user._cancel_enrollment(enrollment.experiment)

    def visit(self):
        """Record that the user has visited the site for the purposes of retention tracking"""
        for enrollment in self._get_all_enrollments():
            if enrollment.experiment.is_displaying_alternatives():
                # We have two different goals, VISIT_NOT_PRESENT_COUNT_GOAL and VISIT_PRESENT_COUNT_GOAL.
                # VISIT_PRESENT_COUNT_GOAL will avoid firing on the first time we set last_seen as it is assumed that the user is
                # on the page and therefore it would automatically trigger and be valueless.
                # This should be used for experiments when we enroll the user as part of the pageview,
#.........这里部分代码省略.........

def get_result_context(request, experiment):
    experiment_counter = ExperimentCounter()

    try:
        chi2_goals = experiment.relevant_chi2_goals.replace(" ", "").split(",")
    except AttributeError:
        chi2_goals = [u'']
    try:
        mwu_goals = experiment.relevant_mwu_goals.replace(" ", "").split(",")
    except AttributeError:
        mwu_goals = [u'']
    relevant_goals = set(chi2_goals + mwu_goals)

    alternatives = {}
    for alternative_name in experiment.alternatives.keys():
        alternatives[alternative_name] = experiment_counter.participant_count(experiment, alternative_name)
    alternatives = sorted(alternatives.items())

    control_participants = experiment_counter.participant_count(experiment, conf.CONTROL_GROUP)

    results = {}

    for goal in conf.ALL_GOALS:
        show_mwu = goal in mwu_goals

        alternatives_conversions = {}
        control_conversions = experiment_counter.goal_count(experiment, conf.CONTROL_GROUP, goal)
        control_conversion_rate = rate(control_conversions, control_participants)

        if show_mwu:
            mwu_histogram = {}
            control_conversion_distribution = fixup_distribution(experiment_counter.goal_distribution(experiment, conf.CONTROL_GROUP, goal), control_participants)
            control_average_goal_actions = average_actions(control_conversion_distribution)
            mwu_histogram['control'] = control_conversion_distribution
        else:
            control_average_goal_actions = None
        for alternative_name in experiment.alternatives.keys():
            if not alternative_name == conf.CONTROL_GROUP:
                alternative_conversions = experiment_counter.goal_count(experiment, alternative_name, goal)
                alternative_participants = experiment_counter.participant_count(experiment, alternative_name)
                alternative_conversion_rate = rate(alternative_conversions, alternative_participants)
                alternative_confidence = chi_squared_confidence(alternative_participants, alternative_conversions, control_participants, control_conversions)
                if show_mwu:
                    alternative_conversion_distribution = fixup_distribution(experiment_counter.goal_distribution(experiment, alternative_name, goal), alternative_participants)
                    alternative_average_goal_actions = average_actions(alternative_conversion_distribution)
                    alternative_distribution_confidence = mann_whitney_confidence(alternative_conversion_distribution, control_conversion_distribution)
                    mwu_histogram[alternative_name] = alternative_conversion_distribution
                else:
                    alternative_average_goal_actions = None
                    alternative_distribution_confidence = None
                alternative = {
                    'conversions': alternative_conversions,
                    'conversion_rate': alternative_conversion_rate,
                    'improvement': improvement(alternative_conversion_rate, control_conversion_rate),
                    'confidence': alternative_confidence,
                    'average_goal_actions': alternative_average_goal_actions,
                    'mann_whitney_confidence': alternative_distribution_confidence,
                }
                alternatives_conversions[alternative_name] = alternative

        control = {
            'conversions': control_conversions,
            'conversion_rate': control_conversion_rate,
            'average_goal_actions': control_average_goal_actions,
        }

        results[goal] = {
            "control": control,
            "alternatives": sorted(alternatives_conversions.items()),
            "relevant": goal in relevant_goals or relevant_goals == {u''},
            "mwu": goal in mwu_goals,
            "mwu_histogram": conversion_distributions_to_graph_table(mwu_histogram) if show_mwu else None
        }

    return {
        'experiment': experiment.to_dict(),
        'alternatives': alternatives,
        'control_participants': control_participants,
        'results': results,
        'column_count': len(alternatives_conversions) * 3 + 2,  # Horrible coupling with template design
        'user_alternative': participant(request).get_alternative(experiment.name),
    }

class ConfirmHumanTestCase(TestCase):
    def setUp(self):
        self.experiment = Experiment.objects.create(name='test_experiment1', state=ENABLED_STATE)
        self.experiment_counter = ExperimentCounter()
        self.experiment_user = participant(session=DatabaseSession())
        self.alternative = self.experiment_user.enroll(self.experiment.name, ['alternative'])
        self.experiment_user.goal('my_goal')

    def tearDown(self):
        self.experiment_counter.delete(self.experiment)

    def test_confirm_human_updates_experiment(self):
        self.assertIn('experiments_goals', self.experiment_user.session)
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, self.alternative), 0)
        self.assertEqual(self.experiment_counter.goal_count(self.experiment, self.alternative, 'my_goal'), 0)
        self.experiment_user.confirm_human()
        self.assertNotIn('experiments_goals', self.experiment_user.session)
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, self.alternative), 1)
        self.assertEqual(self.experiment_counter.goal_count(self.experiment, self.alternative, 'my_goal'), 1)

    def test_confirm_human_called_twice(self):
        """
        Ensuring that counters aren't incremented twice
        """
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, self.alternative), 0)
        self.assertEqual(self.experiment_counter.goal_count(self.experiment, self.alternative, 'my_goal'), 0)
        self.experiment_user.confirm_human()
        self.experiment_user.confirm_human()
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, self.alternative), 1)
        self.assertEqual(self.experiment_counter.goal_count(self.experiment, self.alternative, 'my_goal'), 1)

    def test_confirm_human_sets_session(self):
        self.assertFalse(self.experiment_user.session.get(conf.CONFIRM_HUMAN_SESSION_KEY, False))
        self.experiment_user.confirm_human()
        self.assertTrue(self.experiment_user.session.get(conf.CONFIRM_HUMAN_SESSION_KEY, False))

    def test_session_already_confirmed(self):
        """
        Testing that confirm_human works even if code outside of django-experiments updates the key
        """
        self.experiment_user.session[conf.CONFIRM_HUMAN_SESSION_KEY] = True
        self.experiment_user.confirm_human()
        self.assertEqual(self.experiment_counter.participant_count(self.experiment, self.alternative), 1)
        self.assertEqual(self.experiment_counter.goal_count(self.experiment, self.alternative, 'my_goal'), 1)

 def __init__(self):
     self.experiment_counter = ExperimentCounter()