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tests: Split DeleteMessageTest from test_message_edit.py.

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This commit is contained in:
Alex Vandiver
2024-03-06 14:41:52 +00:00
committed by Tim Abbott
parent 1fb03a27d8
commit 90abb2281d
2 changed files with 324 additions and 313 deletions
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323
zerver/tests/test_message_delete.py Normal file
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@@ -0,0 +1,323 @@
from datetime import timedelta
from typing import TYPE_CHECKING, Optional, Union
from unittest import mock
import orjson
from django.db import IntegrityError
from django.utils.timezone import now as timezone_now
from zerver.actions.message_delete import do_delete_messages
from zerver.actions.realm_settings import do_set_realm_property
from zerver.lib.test_classes import ZulipTestCase
from zerver.models import Message, Realm, UserProfile
from zerver.models.realms import get_realm
if TYPE_CHECKING:
from django.test.client import _MonkeyPatchedWSGIResponse as TestHttpResponse
class DeleteMessageTest(ZulipTestCase):
def test_delete_message_invalid_request_format(self) -> None:
self.login("iago")
hamlet = self.example_user("hamlet")
msg_id = self.send_stream_message(hamlet, "Denmark")
result = self.client_delete(f"/json/messages/{msg_id + 1}", {"message_id": msg_id})
self.assert_json_error(result, "Invalid message(s)")
result = self.client_delete(f"/json/messages/{msg_id}")
self.assert_json_success(result)
def test_delete_message_by_user(self) -> None:
def set_message_deleting_params(
delete_own_message_policy: int, message_content_delete_limit_seconds: Union[int, str]
) -> None:
self.login("iago")
result = self.client_patch(
"/json/realm",
{
"delete_own_message_policy": delete_own_message_policy,
"message_content_delete_limit_seconds": orjson.dumps(
message_content_delete_limit_seconds
).decode(),
},
)
self.assert_json_success(result)
def test_delete_message_by_admin(msg_id: int) -> "TestHttpResponse":
self.login("iago")
result = self.client_delete(f"/json/messages/{msg_id}")
return result
def test_delete_message_by_owner(msg_id: int) -> "TestHttpResponse":
self.login("hamlet")
result = self.client_delete(f"/json/messages/{msg_id}")
return result
def test_delete_message_by_other_user(msg_id: int) -> "TestHttpResponse":
self.login("cordelia")
result = self.client_delete(f"/json/messages/{msg_id}")
return result
# Test if message deleting is not allowed(default).
set_message_deleting_params(Realm.POLICY_ADMINS_ONLY, "unlimited")
hamlet = self.example_user("hamlet")
self.login_user(hamlet)
msg_id = self.send_stream_message(hamlet, "Denmark")
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_other_user(msg_id=msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_admin(msg_id=msg_id)
self.assert_json_success(result)
# Test if message deleting is allowed.
# Test if time limit is None(no limit).
set_message_deleting_params(Realm.POLICY_EVERYONE, "unlimited")
msg_id = self.send_stream_message(hamlet, "Denmark")
message = Message.objects.get(id=msg_id)
message.date_sent = message.date_sent - timedelta(seconds=600)
message.save()
result = test_delete_message_by_other_user(msg_id=msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_success(result)
# Test if time limit is non-zero.
set_message_deleting_params(Realm.POLICY_EVERYONE, 240)
msg_id_1 = self.send_stream_message(hamlet, "Denmark")
message = Message.objects.get(id=msg_id_1)
message.date_sent = message.date_sent - timedelta(seconds=120)
message.save()
msg_id_2 = self.send_stream_message(hamlet, "Denmark")
message = Message.objects.get(id=msg_id_2)
message.date_sent = message.date_sent - timedelta(seconds=360)
message.save()
result = test_delete_message_by_other_user(msg_id=msg_id_1)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_owner(msg_id=msg_id_1)
self.assert_json_success(result)
result = test_delete_message_by_owner(msg_id=msg_id_2)
self.assert_json_error(result, "The time limit for deleting this message has passed")
# No limit for admin.
result = test_delete_message_by_admin(msg_id=msg_id_2)
self.assert_json_success(result)
# Test multiple delete requests with no latency issues
msg_id = self.send_stream_message(hamlet, "Denmark")
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_success(result)
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_error(result, "Invalid message(s)")
# Test handling of 500 error caused by multiple delete requests due to latency.
# see issue #11219.
with mock.patch("zerver.views.message_edit.do_delete_messages") as m, mock.patch(
"zerver.views.message_edit.validate_can_delete_message", return_value=None
), mock.patch("zerver.views.message_edit.access_message", return_value=(None, None)):
m.side_effect = IntegrityError()
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_error(result, "Message already deleted")
m.side_effect = Message.DoesNotExist()
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_error(result, "Message already deleted")
def test_delete_message_sent_by_bots(self) -> None:
iago = self.example_user("iago")
hamlet = self.example_user("hamlet")
cordelia = self.example_user("cordelia")
def set_message_deleting_params(
delete_own_message_policy: int, message_content_delete_limit_seconds: Union[int, str]
) -> None:
result = self.api_patch(
iago,
"/api/v1/realm",
{
"delete_own_message_policy": delete_own_message_policy,
"message_content_delete_limit_seconds": orjson.dumps(
message_content_delete_limit_seconds
).decode(),
},
)
self.assert_json_success(result)
def test_delete_message_by_admin(msg_id: int) -> "TestHttpResponse":
result = self.api_delete(iago, f"/api/v1/messages/{msg_id}")
return result
def test_delete_message_by_bot_owner(msg_id: int) -> "TestHttpResponse":
result = self.api_delete(hamlet, f"/api/v1/messages/{msg_id}")
return result
def test_delete_message_by_other_user(msg_id: int) -> "TestHttpResponse":
result = self.api_delete(cordelia, f"/api/v1/messages/{msg_id}")
return result
set_message_deleting_params(Realm.POLICY_ADMINS_ONLY, "unlimited")
hamlet = self.example_user("hamlet")
test_bot = self.create_test_bot("test-bot", hamlet)
msg_id = self.send_stream_message(test_bot, "Denmark")
result = test_delete_message_by_other_user(msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_bot_owner(msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_admin(msg_id)
self.assert_json_success(result)
msg_id = self.send_stream_message(test_bot, "Denmark")
set_message_deleting_params(Realm.POLICY_EVERYONE, "unlimited")
result = test_delete_message_by_other_user(msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_bot_owner(msg_id)
self.assert_json_success(result)
msg_id = self.send_stream_message(test_bot, "Denmark")
set_message_deleting_params(Realm.POLICY_EVERYONE, 600)
message = Message.objects.get(id=msg_id)
message.date_sent = timezone_now() - timedelta(seconds=700)
message.save()
result = test_delete_message_by_other_user(msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_bot_owner(msg_id)
self.assert_json_error(result, "The time limit for deleting this message has passed")
result = test_delete_message_by_admin(msg_id)
self.assert_json_success(result)
# Check that the bot can also delete the messages sent by them
# depending on the realm permissions for message deletion.
set_message_deleting_params(Realm.POLICY_ADMINS_ONLY, 600)
msg_id = self.send_stream_message(test_bot, "Denmark")
result = self.api_delete(test_bot, f"/api/v1/messages/{msg_id}")
self.assert_json_error(result, "You don't have permission to delete this message")
set_message_deleting_params(Realm.POLICY_EVERYONE, 600)
message = Message.objects.get(id=msg_id)
message.date_sent = timezone_now() - timedelta(seconds=700)
message.save()
result = self.api_delete(test_bot, f"/api/v1/messages/{msg_id}")
self.assert_json_error(result, "The time limit for deleting this message has passed")
message.date_sent = timezone_now() - timedelta(seconds=400)
message.save()
result = self.api_delete(test_bot, f"/api/v1/messages/{msg_id}")
self.assert_json_success(result)
def test_delete_message_according_to_delete_own_message_policy(self) -> None:
def check_delete_message_by_sender(
sender_name: str, error_msg: Optional[str] = None
) -> None:
sender = self.example_user(sender_name)
msg_id = self.send_stream_message(sender, "Verona")
self.login_user(sender)
result = self.client_delete(f"/json/messages/{msg_id}")
if error_msg is None:
self.assert_json_success(result)
else:
self.assert_json_error(result, error_msg)
realm = get_realm("zulip")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_ADMINS_ONLY, acting_user=None
)
check_delete_message_by_sender("shiva", "You don't have permission to delete this message")
check_delete_message_by_sender("iago")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_MODERATORS_ONLY, acting_user=None
)
check_delete_message_by_sender(
"cordelia", "You don't have permission to delete this message"
)
check_delete_message_by_sender("shiva")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_MEMBERS_ONLY, acting_user=None
)
check_delete_message_by_sender(
"polonius", "You don't have permission to delete this message"
)
check_delete_message_by_sender("cordelia")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_FULL_MEMBERS_ONLY, acting_user=None
)
do_set_realm_property(realm, "waiting_period_threshold", 10, acting_user=None)
cordelia = self.example_user("cordelia")
cordelia.date_joined = timezone_now() - timedelta(days=9)
cordelia.save()
check_delete_message_by_sender(
"cordelia", "You don't have permission to delete this message"
)
cordelia.date_joined = timezone_now() - timedelta(days=11)
cordelia.save()
check_delete_message_by_sender("cordelia")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_EVERYONE, acting_user=None
)
check_delete_message_by_sender("cordelia")
check_delete_message_by_sender("polonius")
def test_delete_event_sent_after_transaction_commits(self) -> None:
"""
Tests that `send_event` is hooked to `transaction.on_commit`. This is important, because
we don't want to end up holding locks on message rows for too long if the event queue runs
into a problem.
"""
hamlet = self.example_user("hamlet")
self.send_stream_message(hamlet, "Denmark")
message = self.get_last_message()
with self.capture_send_event_calls(expected_num_events=1):
with mock.patch("zerver.tornado.django_api.queue_json_publish") as m:
m.side_effect = AssertionError(
"Events should be sent only after the transaction commits."
)
do_delete_messages(hamlet.realm, [message])
def test_delete_message_in_unsubscribed_private_stream(self) -> None:
hamlet = self.example_user("hamlet")
iago = self.example_user("iago")
self.assertEqual(iago.role, UserProfile.ROLE_REALM_ADMINISTRATOR)
self.login("hamlet")
self.make_stream("privatestream", invite_only=True, history_public_to_subscribers=False)
self.subscribe(hamlet, "privatestream")
self.subscribe(iago, "privatestream")
msg_id = self.send_stream_message(
hamlet, "privatestream", topic_name="editing", content="before edit"
)
self.unsubscribe(iago, "privatestream")
self.logout()
self.login("iago")
result = self.client_delete(f"/json/messages/{msg_id}")
self.assert_json_error(result, "Invalid message(s)")
self.assertTrue(Message.objects.filter(id=msg_id).exists())
# Ensure iago can delete the message after resubscribing, to be certain
# it's the subscribed/unsubscribed status that's the decisive factor in the
# permission to do so.
self.subscribe(iago, "privatestream")
result = self.client_delete(f"/json/messages/{msg_id}")
self.assert_json_success(result)
self.assertFalse(Message.objects.filter(id=msg_id).exists())

314
zerver/tests/test_message_edit.py
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@@ -1,13 +1,11 @@
from datetime import timedelta
from operator import itemgetter
from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
from typing import Any, Dict, List, Optional, Tuple, Union
from unittest import mock
import orjson
from django.db import IntegrityError
from django.utils.timezone import now as timezone_now
from zerver.actions.message_delete import do_delete_messages
from zerver.actions.message_edit import (
check_update_message,
do_update_message,
@@ -37,9 +35,6 @@ from zerver.models.groups import SystemGroups
from zerver.models.realms import get_realm
from zerver.models.streams import get_stream
if TYPE_CHECKING:
from django.test.client import _MonkeyPatchedWSGIResponse as TestHttpResponse
class EditMessageTestCase(ZulipTestCase):
def check_topic(self, msg_id: int, topic_name: str) -> None:
@@ -4772,310 +4767,3 @@ class EditMessageTest(EditMessageTestCase):
.extra(where=[UserMessage.where_unread()])
.exists()
)
class DeleteMessageTest(ZulipTestCase):
def test_delete_message_invalid_request_format(self) -> None:
self.login("iago")
hamlet = self.example_user("hamlet")
msg_id = self.send_stream_message(hamlet, "Denmark")
result = self.client_delete(f"/json/messages/{msg_id + 1}", {"message_id": msg_id})
self.assert_json_error(result, "Invalid message(s)")
result = self.client_delete(f"/json/messages/{msg_id}")
self.assert_json_success(result)
def test_delete_message_by_user(self) -> None:
def set_message_deleting_params(
delete_own_message_policy: int, message_content_delete_limit_seconds: Union[int, str]
) -> None:
self.login("iago")
result = self.client_patch(
"/json/realm",
{
"delete_own_message_policy": delete_own_message_policy,
"message_content_delete_limit_seconds": orjson.dumps(
message_content_delete_limit_seconds
).decode(),
},
)
self.assert_json_success(result)
def test_delete_message_by_admin(msg_id: int) -> "TestHttpResponse":
self.login("iago")
result = self.client_delete(f"/json/messages/{msg_id}")
return result
def test_delete_message_by_owner(msg_id: int) -> "TestHttpResponse":
self.login("hamlet")
result = self.client_delete(f"/json/messages/{msg_id}")
return result
def test_delete_message_by_other_user(msg_id: int) -> "TestHttpResponse":
self.login("cordelia")
result = self.client_delete(f"/json/messages/{msg_id}")
return result
# Test if message deleting is not allowed(default).
set_message_deleting_params(Realm.POLICY_ADMINS_ONLY, "unlimited")
hamlet = self.example_user("hamlet")
self.login_user(hamlet)
msg_id = self.send_stream_message(hamlet, "Denmark")
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_other_user(msg_id=msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_admin(msg_id=msg_id)
self.assert_json_success(result)
# Test if message deleting is allowed.
# Test if time limit is None(no limit).
set_message_deleting_params(Realm.POLICY_EVERYONE, "unlimited")
msg_id = self.send_stream_message(hamlet, "Denmark")
message = Message.objects.get(id=msg_id)
message.date_sent = message.date_sent - timedelta(seconds=600)
message.save()
result = test_delete_message_by_other_user(msg_id=msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_success(result)
# Test if time limit is non-zero.
set_message_deleting_params(Realm.POLICY_EVERYONE, 240)
msg_id_1 = self.send_stream_message(hamlet, "Denmark")
message = Message.objects.get(id=msg_id_1)
message.date_sent = message.date_sent - timedelta(seconds=120)
message.save()
msg_id_2 = self.send_stream_message(hamlet, "Denmark")
message = Message.objects.get(id=msg_id_2)
message.date_sent = message.date_sent - timedelta(seconds=360)
message.save()
result = test_delete_message_by_other_user(msg_id=msg_id_1)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_owner(msg_id=msg_id_1)
self.assert_json_success(result)
result = test_delete_message_by_owner(msg_id=msg_id_2)
self.assert_json_error(result, "The time limit for deleting this message has passed")
# No limit for admin.
result = test_delete_message_by_admin(msg_id=msg_id_2)
self.assert_json_success(result)
# Test multiple delete requests with no latency issues
msg_id = self.send_stream_message(hamlet, "Denmark")
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_success(result)
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_error(result, "Invalid message(s)")
# Test handling of 500 error caused by multiple delete requests due to latency.
# see issue #11219.
with mock.patch("zerver.views.message_edit.do_delete_messages") as m, mock.patch(
"zerver.views.message_edit.validate_can_delete_message", return_value=None
), mock.patch("zerver.views.message_edit.access_message", return_value=(None, None)):
m.side_effect = IntegrityError()
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_error(result, "Message already deleted")
m.side_effect = Message.DoesNotExist()
result = test_delete_message_by_owner(msg_id=msg_id)
self.assert_json_error(result, "Message already deleted")
def test_delete_message_sent_by_bots(self) -> None:
iago = self.example_user("iago")
hamlet = self.example_user("hamlet")
cordelia = self.example_user("cordelia")
def set_message_deleting_params(
delete_own_message_policy: int, message_content_delete_limit_seconds: Union[int, str]
) -> None:
result = self.api_patch(
iago,
"/api/v1/realm",
{
"delete_own_message_policy": delete_own_message_policy,
"message_content_delete_limit_seconds": orjson.dumps(
message_content_delete_limit_seconds
).decode(),
},
)
self.assert_json_success(result)
def test_delete_message_by_admin(msg_id: int) -> "TestHttpResponse":
result = self.api_delete(iago, f"/api/v1/messages/{msg_id}")
return result
def test_delete_message_by_bot_owner(msg_id: int) -> "TestHttpResponse":
result = self.api_delete(hamlet, f"/api/v1/messages/{msg_id}")
return result
def test_delete_message_by_other_user(msg_id: int) -> "TestHttpResponse":
result = self.api_delete(cordelia, f"/api/v1/messages/{msg_id}")
return result
set_message_deleting_params(Realm.POLICY_ADMINS_ONLY, "unlimited")
hamlet = self.example_user("hamlet")
test_bot = self.create_test_bot("test-bot", hamlet)
msg_id = self.send_stream_message(test_bot, "Denmark")
result = test_delete_message_by_other_user(msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_bot_owner(msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_admin(msg_id)
self.assert_json_success(result)
msg_id = self.send_stream_message(test_bot, "Denmark")
set_message_deleting_params(Realm.POLICY_EVERYONE, "unlimited")
result = test_delete_message_by_other_user(msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_bot_owner(msg_id)
self.assert_json_success(result)
msg_id = self.send_stream_message(test_bot, "Denmark")
set_message_deleting_params(Realm.POLICY_EVERYONE, 600)
message = Message.objects.get(id=msg_id)
message.date_sent = timezone_now() - timedelta(seconds=700)
message.save()
result = test_delete_message_by_other_user(msg_id)
self.assert_json_error(result, "You don't have permission to delete this message")
result = test_delete_message_by_bot_owner(msg_id)
self.assert_json_error(result, "The time limit for deleting this message has passed")
result = test_delete_message_by_admin(msg_id)
self.assert_json_success(result)
# Check that the bot can also delete the messages sent by them
# depending on the realm permissions for message deletion.
set_message_deleting_params(Realm.POLICY_ADMINS_ONLY, 600)
msg_id = self.send_stream_message(test_bot, "Denmark")
result = self.api_delete(test_bot, f"/api/v1/messages/{msg_id}")
self.assert_json_error(result, "You don't have permission to delete this message")
set_message_deleting_params(Realm.POLICY_EVERYONE, 600)
message = Message.objects.get(id=msg_id)
message.date_sent = timezone_now() - timedelta(seconds=700)
message.save()
result = self.api_delete(test_bot, f"/api/v1/messages/{msg_id}")
self.assert_json_error(result, "The time limit for deleting this message has passed")
message.date_sent = timezone_now() - timedelta(seconds=400)
message.save()
result = self.api_delete(test_bot, f"/api/v1/messages/{msg_id}")
self.assert_json_success(result)
def test_delete_message_according_to_delete_own_message_policy(self) -> None:
def check_delete_message_by_sender(
sender_name: str, error_msg: Optional[str] = None
) -> None:
sender = self.example_user(sender_name)
msg_id = self.send_stream_message(sender, "Verona")
self.login_user(sender)
result = self.client_delete(f"/json/messages/{msg_id}")
if error_msg is None:
self.assert_json_success(result)
else:
self.assert_json_error(result, error_msg)
realm = get_realm("zulip")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_ADMINS_ONLY, acting_user=None
)
check_delete_message_by_sender("shiva", "You don't have permission to delete this message")
check_delete_message_by_sender("iago")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_MODERATORS_ONLY, acting_user=None
)
check_delete_message_by_sender(
"cordelia", "You don't have permission to delete this message"
)
check_delete_message_by_sender("shiva")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_MEMBERS_ONLY, acting_user=None
)
check_delete_message_by_sender(
"polonius", "You don't have permission to delete this message"
)
check_delete_message_by_sender("cordelia")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_FULL_MEMBERS_ONLY, acting_user=None
)
do_set_realm_property(realm, "waiting_period_threshold", 10, acting_user=None)
cordelia = self.example_user("cordelia")
cordelia.date_joined = timezone_now() - timedelta(days=9)
cordelia.save()
check_delete_message_by_sender(
"cordelia", "You don't have permission to delete this message"
)
cordelia.date_joined = timezone_now() - timedelta(days=11)
cordelia.save()
check_delete_message_by_sender("cordelia")
do_set_realm_property(
realm, "delete_own_message_policy", Realm.POLICY_EVERYONE, acting_user=None
)
check_delete_message_by_sender("cordelia")
check_delete_message_by_sender("polonius")
def test_delete_event_sent_after_transaction_commits(self) -> None:
"""
Tests that `send_event` is hooked to `transaction.on_commit`. This is important, because
we don't want to end up holding locks on message rows for too long if the event queue runs
into a problem.
"""
hamlet = self.example_user("hamlet")
self.send_stream_message(hamlet, "Denmark")
message = self.get_last_message()
with self.capture_send_event_calls(expected_num_events=1):
with mock.patch("zerver.tornado.django_api.queue_json_publish") as m:
m.side_effect = AssertionError(
"Events should be sent only after the transaction commits."
)
do_delete_messages(hamlet.realm, [message])
def test_delete_message_in_unsubscribed_private_stream(self) -> None:
hamlet = self.example_user("hamlet")
iago = self.example_user("iago")
self.assertEqual(iago.role, UserProfile.ROLE_REALM_ADMINISTRATOR)
self.login("hamlet")
self.make_stream("privatestream", invite_only=True, history_public_to_subscribers=False)
self.subscribe(hamlet, "privatestream")
self.subscribe(iago, "privatestream")
msg_id = self.send_stream_message(
hamlet, "privatestream", topic_name="editing", content="before edit"
)
self.unsubscribe(iago, "privatestream")
self.logout()
self.login("iago")
result = self.client_delete(f"/json/messages/{msg_id}")
self.assert_json_error(result, "Invalid message(s)")
self.assertTrue(Message.objects.filter(id=msg_id).exists())
# Ensure iago can delete the message after resubscribing, to be certain
# it's the subscribed/unsubscribed status that's the decisive factor in the
# permission to do so.
self.subscribe(iago, "privatestream")
result = self.client_delete(f"/json/messages/{msg_id}")
self.assert_json_success(result)
self.assertFalse(Message.objects.filter(id=msg_id).exists())