diff --git a/tests/federation/transport/server/__init__.py b/tests/federation/transport/server/__init__.py
new file mode 100644
index 0000000000..3a5f22c022
--- /dev/null
+++ b/tests/federation/transport/server/__init__.py
@@ -0,0 +1,13 @@
+# 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.
diff --git a/tests/federation/transport/server/test__base.py b/tests/federation/transport/server/test__base.py
new file mode 100644
index 0000000000..98a951f03e
--- /dev/null
+++ b/tests/federation/transport/server/test__base.py
@@ -0,0 +1,112 @@
+# 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 http import HTTPStatus
+from typing import Dict, List, Tuple
+
+from synapse.api.errors import Codes
+from synapse.federation.transport.server import BaseFederationServlet
+from synapse.federation.transport.server._base import Authenticator
+from synapse.http.server import JsonResource, cancellable
+from synapse.server import HomeServer
+from synapse.types import JsonDict
+from synapse.util.ratelimitutils import FederationRateLimiter
+
+from tests import unittest
+from tests.http.server._base import EndpointCancellationTestHelperMixin
+
+
+class CancellableFederationServlet(BaseFederationServlet):
+ PATH = "/sleep"
+
+ def __init__(
+ self,
+ hs: HomeServer,
+ authenticator: Authenticator,
+ ratelimiter: FederationRateLimiter,
+ server_name: str,
+ ):
+ super().__init__(hs, authenticator, ratelimiter, server_name)
+ self.clock = hs.get_clock()
+
+ @cancellable
+ async def on_GET(
+ self, origin: str, content: None, query: Dict[bytes, List[bytes]]
+ ) -> Tuple[int, JsonDict]:
+ await self.clock.sleep(1.0)
+ return HTTPStatus.OK, {"result": True}
+
+ async def on_POST(
+ self, origin: str, content: JsonDict, query: Dict[bytes, List[bytes]]
+ ) -> Tuple[int, JsonDict]:
+ await self.clock.sleep(1.0)
+ return HTTPStatus.OK, {"result": True}
+
+
+class BaseFederationServletCancellationTests(
+ unittest.FederatingHomeserverTestCase, EndpointCancellationTestHelperMixin
+):
+ """Tests for `BaseFederationServlet` cancellation."""
+
+ path = f"{CancellableFederationServlet.PREFIX}{CancellableFederationServlet.PATH}"
+
+ def create_test_resource(self):
+ """Overrides `HomeserverTestCase.create_test_resource`."""
+ resource = JsonResource(self.hs)
+
+ CancellableFederationServlet(
+ hs=self.hs,
+ authenticator=Authenticator(self.hs),
+ ratelimiter=self.hs.get_federation_ratelimiter(),
+ server_name=self.hs.hostname,
+ ).register(resource)
+
+ return resource
+
+ def test_cancellable_disconnect(self) -> None:
+ """Test that handlers with the `@cancellable` flag can be cancelled."""
+ channel = self.make_signed_federation_request(
+ "GET", self.path, await_result=False
+ )
+
+ # Advance past all the rate limiting logic. If we disconnect too early, the
+ # request won't be processed.
+ self.pump()
+
+ self._test_disconnect(
+ self.reactor,
+ channel,
+ expect_cancellation=True,
+ expected_body={"error": "Request cancelled", "errcode": Codes.UNKNOWN},
+ )
+
+ def test_uncancellable_disconnect(self) -> None:
+ """Test that handlers without the `@cancellable` flag cannot be cancelled."""
+ channel = self.make_signed_federation_request(
+ "POST",
+ self.path,
+ content={},
+ await_result=False,
+ )
+
+ # Advance past all the rate limiting logic. If we disconnect too early, the
+ # request won't be processed.
+ self.pump()
+
+ self._test_disconnect(
+ self.reactor,
+ channel,
+ expect_cancellation=False,
+ expected_body={"result": True},
+ )
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