Misago/misago/threads/tests/test_privatethread_patch_api.py

import json

from django.contrib.auth import get_user_model
from django.core import mail

from misago.acl.testutils import override_acl
from misago.threads import testutils
from misago.threads.models import Thread, ThreadParticipant

from .test_privatethreads import PrivateThreadsTestCase


UserModel = get_user_model()


class PrivateThreadPatchApiTestCase(PrivateThreadsTestCase):
    def setUp(self):
        super().setUp()

        self.thread = testutils.post_thread(self.category, poster=self.user)
        self.api_link = self.thread.get_api_url()

        self.other_user = UserModel.objects.create_user(
            'BobBoberson', 'bob@boberson.com', 'pass123'
        )

    def patch(self, api_link, ops):
        return self.client.patch(api_link, json.dumps(ops), content_type="application/json")


class PrivateThreadAddParticipantApiTests(PrivateThreadPatchApiTestCase):
    def test_add_participant_not_owner(self):
        """non-owner can't add participant"""
        ThreadParticipant.objects.add_participants(self.thread, [self.user])

        response = self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.user.username,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["You have to be thread owner to add new participants to it."],
        })

    def test_add_empty_username(self):
        """path validates username"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': '',
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["You have to enter new participant's username."],
        })

    def test_add_nonexistant_user(self):
        """can't user two times"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': 'InvalidUser',
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["No user with such name exists."],
        })

    def test_add_already_participant(self):
        """can't add user that is already participant"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.user.username,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["This user is already thread participant."],
        })

    def test_add_blocking_user(self):
        """can't add user that is already participant"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)
        self.other_user.blocks.add(self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.other_user.username,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["BobBoberson is blocking you."],
        })

    def test_add_no_perm_user(self):
        """can't add user that has no permission to use private threads"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        override_acl(self.other_user, {'can_use_private_threads': 0})

        response = self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.other_user.username,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["BobBoberson can't participate in private threads."],
        })

    def test_add_too_many_users(self):
        """can't add user that is already participant"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        for i in range(self.user.acl_cache['max_private_thread_participants']):
            user = UserModel.objects.create_user(
                'User%s' % i, 'user%s@example.com' % i, 'Pass.123'
            )
            ThreadParticipant.objects.add_participants(self.thread, [user])

        response = self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.other_user.username,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["You can't add any more new users to this thread."],
        })

    def test_add_user_closed_thread(self):
        """adding user to closed thread fails for non-moderator"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        self.thread.is_closed = True
        self.thread.save()

        response = self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.other_user.username,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["Only moderators can add participants to closed threads."],
        })

    def test_add_user(self):
        """adding user to thread add user to thread as participant, sets event and emails him"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.other_user.username,
                },
            ]
        )

        # event was set on thread
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'added_participant')

        # notification about new private thread was sent to other user
        self.assertEqual(len(mail.outbox), 1)
        email = mail.outbox[-1]

        self.assertIn(self.user.username, email.subject)
        self.assertIn(self.thread.title, email.subject)

    def test_add_user_to_other_user_thread_moderator(self):
        """moderators can add users to other users threads"""
        ThreadParticipant.objects.set_owner(self.thread, self.other_user)

        self.thread.has_reported_posts = True
        self.thread.save()

        override_acl(self.user, {'can_moderate_private_threads': 1})

        self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.user.username,
                },
            ]
        )

        # event was set on thread
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'entered_thread')

        # notification about new private thread wasn't send because we invited ourselves
        self.assertEqual(len(mail.outbox), 0)

    def test_add_user_to_closed_moderator(self):
        """moderators can add users to closed threads"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        self.thread.is_closed = True
        self.thread.save()

        override_acl(self.user, {'can_moderate_private_threads': 1})

        self.patch(
            self.api_link, [
                {
                    'op': 'add',
                    'path': 'participants',
                    'value': self.other_user.username,
                },
            ]
        )

        # event was set on thread
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'added_participant')

        # notification about new private thread was sent to other user
        self.assertEqual(len(mail.outbox), 1)
        email = mail.outbox[-1]

        self.assertIn(self.user.username, email.subject)
        self.assertIn(self.thread.title, email.subject)


class PrivateThreadRemoveParticipantApiTests(PrivateThreadPatchApiTestCase):
    def test_remove_empty(self):
        """api handles empty user id"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': '',
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["A valid integer is required."],
        })

    def test_remove_invalid(self):
        """api validates user id type"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': 'string',
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["A valid integer is required."],
        })

    def test_remove_nonexistant(self):
        """removed user has to be participant"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': self.other_user.pk,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["Participant doesn't exist."],
        })

    def test_remove_not_owner(self):
        """api validates if user trying to remove other user is an owner"""
        ThreadParticipant.objects.set_owner(self.thread, self.other_user)
        ThreadParticipant.objects.add_participants(self.thread, [self.user])

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': self.other_user.pk,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["You have to be thread owner to remove participants from it."],
        })

    def test_owner_remove_user_closed_thread(self):
        """api disallows owner to remove other user from closed thread"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)
        ThreadParticipant.objects.add_participants(self.thread, [self.other_user])

        self.thread.is_closed = True
        self.thread.save()

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': self.other_user.pk,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["Only moderators can remove participants from closed threads."],
        })

    def test_user_leave_thread(self):
        """api allows user to remove himself from thread"""
        ThreadParticipant.objects.set_owner(self.thread, self.other_user)
        ThreadParticipant.objects.add_participants(self.thread, [self.user])

        self.user.subscription_set.create(
            category=self.category,
            thread=self.thread,
        )

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': self.user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)
        self.assertFalse(response.json()['deleted'])

        # thread still exists
        self.assertTrue(Thread.objects.get(pk=self.thread.pk))

        # leave event has valid type
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'participant_left')

        # valid users were flagged for sync
        self.assertTrue(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)

        # user was removed from participation
        self.assertEqual(self.thread.participants.count(), 1)
        self.assertEqual(self.thread.participants.filter(pk=self.user.pk).count(), 0)

        # thread was removed from user subscriptions
        self.assertEqual(self.user.subscription_set.count(), 0)

    def test_user_leave_closed_thread(self):
        """api allows user to remove himself from closed thread"""
        ThreadParticipant.objects.set_owner(self.thread, self.other_user)
        ThreadParticipant.objects.add_participants(self.thread, [self.user])

        self.thread.is_closed = True
        self.thread.save()

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': self.user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)
        self.assertFalse(response.json()['deleted'])

        # thread still exists
        self.assertTrue(Thread.objects.get(pk=self.thread.pk))

        # leave event has valid type
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'participant_left')

        # valid users were flagged for sync
        self.assertTrue(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)

        # user was removed from participation
        self.assertEqual(self.thread.participants.count(), 1)
        self.assertEqual(self.thread.participants.filter(pk=self.user.pk).count(), 0)

    def test_moderator_remove_user(self):
        """api allows moderator to remove other user"""
        removed_user = UserModel.objects.create_user('Vigilante', 'test@test.com', 'pass123')

        ThreadParticipant.objects.set_owner(self.thread, self.other_user)
        ThreadParticipant.objects.add_participants(self.thread, [self.user, removed_user])

        override_acl(self.user, {'can_moderate_private_threads': True})

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': removed_user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)
        self.assertFalse(response.json()['deleted'])

        # thread still exists
        self.assertTrue(Thread.objects.get(pk=self.thread.pk))

        # leave event has valid type
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'participant_removed')

        # valid users were flagged for sync
        self.assertTrue(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=removed_user.pk).sync_unread_private_threads)

        # user was removed from participation
        self.assertEqual(self.thread.participants.count(), 2)
        self.assertEqual(self.thread.participants.filter(pk=removed_user.pk).count(), 0)

    def test_owner_remove_user(self):
        """api allows owner to remove other user"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)
        ThreadParticipant.objects.add_participants(self.thread, [self.other_user])

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': self.other_user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)
        self.assertFalse(response.json()['deleted'])

        # thread still exists
        self.assertTrue(Thread.objects.get(pk=self.thread.pk))

        # leave event has valid type
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'participant_removed')

        # valid users were flagged for sync
        self.assertTrue(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)

        # user was removed from participation
        self.assertEqual(self.thread.participants.count(), 1)
        self.assertEqual(self.thread.participants.filter(pk=self.other_user.pk).count(), 0)

    def test_owner_leave_thread(self):
        """api allows owner to remove hisemf from thread, causing thread to close"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)
        ThreadParticipant.objects.add_participants(self.thread, [self.other_user])

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': self.user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)
        self.assertFalse(response.json()['deleted'])

        # thread still exists and is closed
        self.assertTrue(Thread.objects.get(pk=self.thread.pk).is_closed)

        # leave event has valid type
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'owner_left')

        # valid users were flagged for sync
        self.assertTrue(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)

        # user was removed from participation
        self.assertEqual(self.thread.participants.count(), 1)
        self.assertEqual(self.thread.participants.filter(pk=self.user.pk).count(), 0)

    def test_last_user_leave_thread(self):
        """api allows last user leave thread, causing thread to delete"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'remove',
                    'path': 'participants',
                    'value': self.user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)
        self.assertTrue(response.json()['deleted'])

        # thread is gone
        with self.assertRaises(Thread.DoesNotExist):
            Thread.objects.get(pk=self.thread.pk)

        # valid users were flagged for sync
        self.assertTrue(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)


class PrivateThreadTakeOverApiTests(PrivateThreadPatchApiTestCase):
    def test_empty_user_id(self):
        """api handles empty user id"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': '',
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["A valid integer is required."],
        })

    def test_invalid_user_id(self):
        """api handles invalid user id"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': 'dsadsa',
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["A valid integer is required."],
        })

    def test_nonexistant_user_id(self):
        """api handles nonexistant user id"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': self.other_user.pk,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["Participant doesn't exist."],
        })

    def test_no_permission(self):
        """non-moderator/owner can't change owner"""
        ThreadParticipant.objects.set_owner(self.thread, self.other_user)
        ThreadParticipant.objects.add_participants(self.thread, [self.user])

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': self.user.pk,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["Only thread owner and moderators can change threads owners."],
        })

    def test_no_change(self):
        """api validates that new owner id is same as current owner"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)
        ThreadParticipant.objects.add_participants(self.thread, [self.other_user])

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': self.user.pk,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["This user already is thread owner."],
        })

    def test_change_closed_thread_owner(self):
        """non-moderator can't change owner in closed thread"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)
        ThreadParticipant.objects.add_participants(self.thread, [self.other_user])

        self.thread.is_closed = True
        self.thread.save()

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': self.other_user.pk,
                },
            ]
        )
        self.assertEqual(response.status_code, 400)
        self.assertEqual(response.json(), {
            'id': self.thread.pk,
            'detail': ["Only moderators can change closed threads owners."],
        })

    def test_owner_change_thread_owner(self):
        """owner can pass thread ownership to other participant"""
        ThreadParticipant.objects.set_owner(self.thread, self.user)
        ThreadParticipant.objects.add_participants(self.thread, [self.other_user])

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': self.other_user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)

        # valid users were flagged for sync
        self.assertFalse(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)

        # ownership was transfered
        self.assertEqual(self.thread.participants.count(), 2)
        self.assertTrue(ThreadParticipant.objects.get(user=self.other_user).is_owner)
        self.assertFalse(ThreadParticipant.objects.get(user=self.user).is_owner)

        # change was recorded in event
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'changed_owner')

    def test_moderator_change_owner(self):
        """moderator can change thread owner to other user"""
        new_owner = UserModel.objects.create_user('NewOwner', 'new@owner.com', 'pass123')

        ThreadParticipant.objects.set_owner(self.thread, self.other_user)
        ThreadParticipant.objects.add_participants(self.thread, [self.user, new_owner])

        override_acl(self.user, {'can_moderate_private_threads': 1})

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': new_owner.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)

        # valid users were flagged for sync
        self.assertTrue(UserModel.objects.get(pk=new_owner.pk).sync_unread_private_threads)
        self.assertFalse(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)

        # ownership was transfered
        self.assertEqual(self.thread.participants.count(), 3)
        self.assertTrue(ThreadParticipant.objects.get(user=new_owner).is_owner)
        self.assertFalse(ThreadParticipant.objects.get(user=self.user).is_owner)
        self.assertFalse(ThreadParticipant.objects.get(user=self.other_user).is_owner)

        # change was recorded in event
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'changed_owner')

    def test_moderator_takeover(self):
        """moderator can takeover the thread"""
        ThreadParticipant.objects.set_owner(self.thread, self.other_user)
        ThreadParticipant.objects.add_participants(self.thread, [self.user])

        override_acl(self.user, {'can_moderate_private_threads': 1})

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': self.user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)

        # valid users were flagged for sync
        self.assertFalse(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)

        # ownership was transfered
        self.assertEqual(self.thread.participants.count(), 2)
        self.assertTrue(ThreadParticipant.objects.get(user=self.user).is_owner)
        self.assertFalse(ThreadParticipant.objects.get(user=self.other_user).is_owner)

        # change was recorded in event
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'tookover')

    def test_moderator_closed_thread_takeover(self):
        """moderator can takeover closed thread thread"""
        ThreadParticipant.objects.set_owner(self.thread, self.other_user)
        ThreadParticipant.objects.add_participants(self.thread, [self.user])

        self.thread.is_closed = True
        self.thread.save()

        override_acl(self.user, {'can_moderate_private_threads': 1})

        response = self.patch(
            self.api_link, [
                {
                    'op': 'replace',
                    'path': 'owner',
                    'value': self.user.pk,
                },
            ]
        )

        self.assertEqual(response.status_code, 200)

        # valid users were flagged for sync
        self.assertFalse(UserModel.objects.get(pk=self.user.pk).sync_unread_private_threads)
        self.assertTrue(UserModel.objects.get(pk=self.other_user.pk).sync_unread_private_threads)

        # ownership was transfered
        self.assertEqual(self.thread.participants.count(), 2)
        self.assertTrue(ThreadParticipant.objects.get(user=self.user).is_owner)
        self.assertFalse(ThreadParticipant.objects.get(user=self.other_user).is_owner)

        # change was recorded in event
        event = self.thread.post_set.order_by('id').last()
        self.assertTrue(event.is_event)
        self.assertTrue(event.event_type, 'tookover')