diff --git a/tests/appservice/test_api.py b/tests/appservice/test_api.py
new file mode 100644
index 0000000000..3e0db4dd98
--- /dev/null
+++ b/tests/appservice/test_api.py
@@ -0,0 +1,102 @@
+# 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 typing import Any, List, Mapping
+from unittest.mock import Mock
+
+from twisted.test.proto_helpers import MemoryReactor
+
+from synapse.appservice import ApplicationService
+from synapse.server import HomeServer
+from synapse.types import JsonDict
+from synapse.util import Clock
+
+from tests import unittest
+
+PROTOCOL = "myproto"
+TOKEN = "myastoken"
+URL = "http://mytestservice"
+
+
+class ApplicationServiceApiTestCase(unittest.HomeserverTestCase):
+ def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer):
+ self.api = hs.get_application_service_api()
+ self.service = ApplicationService(
+ id="unique_identifier",
+ sender="@as:test",
+ url=URL,
+ token="unused",
+ hs_token=TOKEN,
+ hostname="myserver",
+ )
+
+ def test_query_3pe_authenticates_token(self):
+ """
+ Tests that 3pe queries to the appservice are authenticated
+ with the appservice's token.
+ """
+
+ SUCCESS_RESULT_USER = [
+ {
+ "protocol": PROTOCOL,
+ "userid": "@a:user",
+ "fields": {
+ "more": "fields",
+ },
+ }
+ ]
+ SUCCESS_RESULT_LOCATION = [
+ {
+ "protocol": PROTOCOL,
+ "alias": "#a:room",
+ "fields": {
+ "more": "fields",
+ },
+ }
+ ]
+
+ URL_USER = f"{URL}/_matrix/app/unstable/thirdparty/user/{PROTOCOL}"
+ URL_LOCATION = f"{URL}/_matrix/app/unstable/thirdparty/location/{PROTOCOL}"
+
+ self.request_url = None
+
+ async def get_json(url: str, args: Mapping[Any, Any]) -> List[JsonDict]:
+ if not args.get(b"access_token"):
+ raise RuntimeError("Access token not provided")
+
+ self.assertEqual(args.get(b"access_token"), TOKEN)
+ self.request_url = url
+ if url == URL_USER:
+ return SUCCESS_RESULT_USER
+ elif url == URL_LOCATION:
+ return SUCCESS_RESULT_LOCATION
+ else:
+ raise RuntimeError(
+ "URL provided was invalid. This should never be seen."
+ )
+
+ # We assign to a method, which mypy doesn't like.
+ self.api.get_json = Mock(side_effect=get_json) # type: ignore[assignment]
+
+ result = self.get_success(
+ self.api.query_3pe(self.service, "user", PROTOCOL, {b"some": [b"field"]})
+ )
+ self.assertEqual(self.request_url, URL_USER)
+ self.assertEqual(result, SUCCESS_RESULT_USER)
+ result = self.get_success(
+ self.api.query_3pe(
+ self.service, "location", PROTOCOL, {b"some": [b"field"]}
+ )
+ )
+ self.assertEqual(self.request_url, URL_LOCATION)
+ self.assertEqual(result, SUCCESS_RESULT_LOCATION)
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