diff --git a/tests/handlers/test_sso.py b/tests/handlers/test_sso.py
new file mode 100644
index 0000000000..137deab138
--- /dev/null
+++ b/tests/handlers/test_sso.py
@@ -0,0 +1,145 @@
+# 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 BinaryIO, Callable, Dict, List, Optional, Tuple
+from unittest.mock import Mock
+
+from twisted.test.proto_helpers import MemoryReactor
+from twisted.web.http_headers import Headers
+
+from synapse.api.errors import Codes, SynapseError
+from synapse.http.client import RawHeaders
+from synapse.server import HomeServer
+from synapse.util import Clock
+
+from tests import unittest
+from tests.test_utils import SMALL_PNG, FakeResponse
+
+
+class TestSSOHandler(unittest.HomeserverTestCase):
+ def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
+ self.http_client = Mock(spec=["get_file"])
+ self.http_client.get_file.side_effect = mock_get_file
+ self.http_client.user_agent = b"Synapse Test"
+ hs = self.setup_test_homeserver(
+ proxied_blacklisted_http_client=self.http_client
+ )
+ return hs
+
+ async def test_set_avatar(self) -> None:
+ """Tests successfully setting the avatar of a newly created user"""
+ handler = self.hs.get_sso_handler()
+
+ # Create a new user to set avatar for
+ reg_handler = self.hs.get_registration_handler()
+ user_id = self.get_success(reg_handler.register_user(approved=True))
+
+ self.assertTrue(
+ self.get_success(handler.set_avatar(user_id, "http://my.server/me.png"))
+ )
+
+ # Ensure avatar is set on this newly created user,
+ # so no need to compare for the exact image
+ profile_handler = self.hs.get_profile_handler()
+ profile = self.get_success(profile_handler.get_profile(user_id))
+ self.assertIsNot(profile["avatar_url"], None)
+
+ @unittest.override_config({"max_avatar_size": 1})
+ async def test_set_avatar_too_big_image(self) -> None:
+ """Tests that saving an avatar fails when it is too big"""
+ handler = self.hs.get_sso_handler()
+
+ # any random user works since image check is supposed to fail
+ user_id = "@sso-user:test"
+
+ self.assertFalse(
+ self.get_success(handler.set_avatar(user_id, "http://my.server/me.png"))
+ )
+
+ @unittest.override_config({"allowed_avatar_mimetypes": ["image/jpeg"]})
+ async def test_set_avatar_incorrect_mime_type(self) -> None:
+ """Tests that saving an avatar fails when its mime type is not allowed"""
+ handler = self.hs.get_sso_handler()
+
+ # any random user works since image check is supposed to fail
+ user_id = "@sso-user:test"
+
+ self.assertFalse(
+ self.get_success(handler.set_avatar(user_id, "http://my.server/me.png"))
+ )
+
+ async def test_skip_saving_avatar_when_not_changed(self) -> None:
+ """Tests whether saving of avatar correctly skips if the avatar hasn't
+ changed"""
+ handler = self.hs.get_sso_handler()
+
+ # Create a new user to set avatar for
+ reg_handler = self.hs.get_registration_handler()
+ user_id = self.get_success(reg_handler.register_user(approved=True))
+
+ # set avatar for the first time, should be a success
+ self.assertTrue(
+ self.get_success(handler.set_avatar(user_id, "http://my.server/me.png"))
+ )
+
+ # get avatar picture for comparison after another attempt
+ profile_handler = self.hs.get_profile_handler()
+ profile = self.get_success(profile_handler.get_profile(user_id))
+ url_to_match = profile["avatar_url"]
+
+ # set same avatar for the second time, should be a success
+ self.assertTrue(
+ self.get_success(handler.set_avatar(user_id, "http://my.server/me.png"))
+ )
+
+ # compare avatar picture's url from previous step
+ profile = self.get_success(profile_handler.get_profile(user_id))
+ self.assertEqual(profile["avatar_url"], url_to_match)
+
+
+async def mock_get_file(
+ url: str,
+ output_stream: BinaryIO,
+ max_size: Optional[int] = None,
+ headers: Optional[RawHeaders] = None,
+ is_allowed_content_type: Optional[Callable[[str], bool]] = None,
+) -> Tuple[int, Dict[bytes, List[bytes]], str, int]:
+
+ fake_response = FakeResponse(code=404)
+ if url == "http://my.server/me.png":
+ fake_response = FakeResponse(
+ code=200,
+ headers=Headers(
+ {"Content-Type": ["image/png"], "Content-Length": [str(len(SMALL_PNG))]}
+ ),
+ body=SMALL_PNG,
+ )
+
+ if max_size is not None and max_size < len(SMALL_PNG):
+ raise SynapseError(
+ HTTPStatus.BAD_GATEWAY,
+ "Requested file is too large > %r bytes" % (max_size,),
+ Codes.TOO_LARGE,
+ )
+
+ if is_allowed_content_type and not is_allowed_content_type("image/png"):
+ raise SynapseError(
+ HTTPStatus.BAD_GATEWAY,
+ (
+ "Requested file's content type not allowed for this operation: %s"
+ % "image/png"
+ ),
+ )
+
+ output_stream.write(fake_response.body)
+
+ return len(SMALL_PNG), {b"Content-Type": [b"image/png"]}, "", 200
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