diff --git a/tests/handlers/test_deactivate_account.py b/tests/handlers/test_deactivate_account.py
new file mode 100644
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--- /dev/null
+++ b/tests/handlers/test_deactivate_account.py
@@ -0,0 +1,219 @@
+# Copyright 2021 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from http import HTTPStatus
+from typing import Any, Dict
+
+from twisted.test.proto_helpers import MemoryReactor
+
+from synapse.api.constants import AccountDataTypes
+from synapse.push.rulekinds import PRIORITY_CLASS_MAP
+from synapse.rest import admin
+from synapse.rest.client import account, login
+from synapse.server import HomeServer
+from synapse.util import Clock
+
+from tests.unittest import HomeserverTestCase
+
+
+class DeactivateAccountTestCase(HomeserverTestCase):
+ servlets = [
+ login.register_servlets,
+ admin.register_servlets,
+ account.register_servlets,
+ ]
+
+ def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
+ self._store = hs.get_datastore()
+
+ self.user = self.register_user("user", "pass")
+ self.token = self.login("user", "pass")
+
+ def _deactivate_my_account(self):
+ """
+ Deactivates the account `self.user` using `self.token` and asserts
+ that it returns a 200 success code.
+ """
+ req = self.get_success(
+ self.make_request(
+ "POST",
+ "account/deactivate",
+ {
+ "auth": {
+ "type": "m.login.password",
+ "user": self.user,
+ "password": "pass",
+ },
+ "erase": True,
+ },
+ access_token=self.token,
+ )
+ )
+ self.assertEqual(req.code, HTTPStatus.OK, req)
+
+ def test_global_account_data_deleted_upon_deactivation(self) -> None:
+ """
+ Tests that global account data is removed upon deactivation.
+ """
+ # Add some account data
+ self.get_success(
+ self._store.add_account_data_for_user(
+ self.user,
+ AccountDataTypes.DIRECT,
+ {"@someone:remote": ["!somewhere:remote"]},
+ )
+ )
+
+ # Check that we actually added some.
+ self.assertIsNotNone(
+ self.get_success(
+ self._store.get_global_account_data_by_type_for_user(
+ self.user, AccountDataTypes.DIRECT
+ )
+ ),
+ )
+
+ # Request the deactivation of our account
+ self._deactivate_my_account()
+
+ # Check that the account data does not persist.
+ self.assertIsNone(
+ self.get_success(
+ self._store.get_global_account_data_by_type_for_user(
+ self.user, AccountDataTypes.DIRECT
+ )
+ ),
+ )
+
+ def test_room_account_data_deleted_upon_deactivation(self) -> None:
+ """
+ Tests that room account data is removed upon deactivation.
+ """
+ room_id = "!room:test"
+
+ # Add some room account data
+ self.get_success(
+ self._store.add_account_data_to_room(
+ self.user,
+ room_id,
+ "m.fully_read",
+ {"event_id": "$aaaa:test"},
+ )
+ )
+
+ # Check that we actually added some.
+ self.assertIsNotNone(
+ self.get_success(
+ self._store.get_account_data_for_room_and_type(
+ self.user, room_id, "m.fully_read"
+ )
+ ),
+ )
+
+ # Request the deactivation of our account
+ self._deactivate_my_account()
+
+ # Check that the account data does not persist.
+ self.assertIsNone(
+ self.get_success(
+ self._store.get_account_data_for_room_and_type(
+ self.user, room_id, "m.fully_read"
+ )
+ ),
+ )
+
+ def _is_custom_rule(self, push_rule: Dict[str, Any]) -> bool:
+ """
+ Default rules start with a dot: such as .m.rule and .im.vector.
+ This function returns true iff a rule is custom (not default).
+ """
+ return "/." not in push_rule["rule_id"]
+
+ def test_push_rules_deleted_upon_account_deactivation(self) -> None:
+ """
+ Push rules are a special case of account data.
+ They are stored separately but get sent to the client as account data in /sync.
+ This tests that deactivating a user deletes push rules along with the rest
+ of their account data.
+ """
+
+ # Add a push rule
+ self.get_success(
+ self._store.add_push_rule(
+ self.user,
+ "personal.override.rule1",
+ PRIORITY_CLASS_MAP["override"],
+ [],
+ [],
+ )
+ )
+
+ # Test the rule exists
+ push_rules = self.get_success(self._store.get_push_rules_for_user(self.user))
+ # Filter out default rules; we don't care
+ push_rules = list(filter(self._is_custom_rule, push_rules))
+ # Check our rule made it
+ self.assertEqual(
+ push_rules,
+ [
+ {
+ "user_name": "@user:test",
+ "rule_id": "personal.override.rule1",
+ "priority_class": 5,
+ "priority": 0,
+ "conditions": [],
+ "actions": [],
+ "default": False,
+ }
+ ],
+ push_rules,
+ )
+
+ # Request the deactivation of our account
+ self._deactivate_my_account()
+
+ push_rules = self.get_success(self._store.get_push_rules_for_user(self.user))
+ # Filter out default rules; we don't care
+ push_rules = list(filter(self._is_custom_rule, push_rules))
+ # Check our rule no longer exists
+ self.assertEqual(push_rules, [], push_rules)
+
+ def test_ignored_users_deleted_upon_deactivation(self) -> None:
+ """
+ Ignored users are a special case of account data.
+ They get denormalised into the `ignored_users` table upon being stored as
+ account data.
+ Test that a user's list of ignored users is deleted upon deactivation.
+ """
+
+ # Add an ignored user
+ self.get_success(
+ self._store.add_account_data_for_user(
+ self.user,
+ AccountDataTypes.IGNORED_USER_LIST,
+ {"ignored_users": {"@sheltie:test": {}}},
+ )
+ )
+
+ # Test the user is ignored
+ self.assertEqual(
+ self.get_success(self._store.ignored_by("@sheltie:test")), {self.user}
+ )
+
+ # Request the deactivation of our account
+ self._deactivate_my_account()
+
+ # Test the user is no longer ignored by the user that was deactivated
+ self.assertEqual(
+ self.get_success(self._store.ignored_by("@sheltie:test")), set()
+ )
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