diff --git a/tests/rest/client/test_login_token_request.py b/tests/rest/client/test_login_token_request.py
new file mode 100644
index 0000000000..d5bb16c98d
--- /dev/null
+++ b/tests/rest/client/test_login_token_request.py
@@ -0,0 +1,132 @@
+# Copyright 2022 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 twisted.test.proto_helpers import MemoryReactor
+
+from synapse.rest import admin
+from synapse.rest.client import login, login_token_request
+from synapse.server import HomeServer
+from synapse.util import Clock
+
+from tests import unittest
+from tests.unittest import override_config
+
+
+class LoginTokenRequestServletTestCase(unittest.HomeserverTestCase):
+
+ servlets = [
+ login.register_servlets,
+ admin.register_servlets,
+ login_token_request.register_servlets,
+ ]
+
+ def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
+ self.hs = self.setup_test_homeserver()
+ self.hs.config.registration.enable_registration = True
+ self.hs.config.registration.registrations_require_3pid = []
+ self.hs.config.registration.auto_join_rooms = []
+ self.hs.config.captcha.enable_registration_captcha = False
+
+ return self.hs
+
+ def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
+ self.user = "user123"
+ self.password = "password"
+
+ def test_disabled(self) -> None:
+ channel = self.make_request("POST", "/login/token", {}, access_token=None)
+ self.assertEqual(channel.code, 400)
+
+ self.register_user(self.user, self.password)
+ token = self.login(self.user, self.password)
+
+ channel = self.make_request("POST", "/login/token", {}, access_token=token)
+ self.assertEqual(channel.code, 400)
+
+ @override_config({"experimental_features": {"msc3882_enabled": True}})
+ def test_require_auth(self) -> None:
+ channel = self.make_request("POST", "/login/token", {}, access_token=None)
+ self.assertEqual(channel.code, 401)
+
+ @override_config({"experimental_features": {"msc3882_enabled": True}})
+ def test_uia_on(self) -> None:
+ user_id = self.register_user(self.user, self.password)
+ token = self.login(self.user, self.password)
+
+ channel = self.make_request("POST", "/login/token", {}, access_token=token)
+ self.assertEqual(channel.code, 401)
+ self.assertIn({"stages": ["m.login.password"]}, channel.json_body["flows"])
+
+ session = channel.json_body["session"]
+
+ uia = {
+ "auth": {
+ "type": "m.login.password",
+ "identifier": {"type": "m.id.user", "user": self.user},
+ "password": self.password,
+ "session": session,
+ },
+ }
+
+ channel = self.make_request("POST", "/login/token", uia, access_token=token)
+ self.assertEqual(channel.code, 200)
+ self.assertEqual(channel.json_body["expires_in"], 300)
+
+ login_token = channel.json_body["login_token"]
+
+ channel = self.make_request(
+ "POST",
+ "/login",
+ content={"type": "m.login.token", "token": login_token},
+ )
+ self.assertEqual(channel.code, 200, channel.result)
+ self.assertEqual(channel.json_body["user_id"], user_id)
+
+ @override_config(
+ {"experimental_features": {"msc3882_enabled": True, "msc3882_ui_auth": False}}
+ )
+ def test_uia_off(self) -> None:
+ user_id = self.register_user(self.user, self.password)
+ token = self.login(self.user, self.password)
+
+ channel = self.make_request("POST", "/login/token", {}, access_token=token)
+ self.assertEqual(channel.code, 200)
+ self.assertEqual(channel.json_body["expires_in"], 300)
+
+ login_token = channel.json_body["login_token"]
+
+ channel = self.make_request(
+ "POST",
+ "/login",
+ content={"type": "m.login.token", "token": login_token},
+ )
+ self.assertEqual(channel.code, 200, channel.result)
+ self.assertEqual(channel.json_body["user_id"], user_id)
+
+ @override_config(
+ {
+ "experimental_features": {
+ "msc3882_enabled": True,
+ "msc3882_ui_auth": False,
+ "msc3882_token_timeout": "15s",
+ }
+ }
+ )
+ def test_expires_in(self) -> None:
+ self.register_user(self.user, self.password)
+ token = self.login(self.user, self.password)
+
+ channel = self.make_request("POST", "/login/token", {}, access_token=token)
+ self.assertEqual(channel.code, 200)
+ self.assertEqual(channel.json_body["expires_in"], 15)
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