diff --git a/tests/rest/admin/test_jwks.py b/tests/rest/admin/test_jwks.py
new file mode 100644
index 0000000000..a9a6191c73
--- /dev/null
+++ b/tests/rest/admin/test_jwks.py
@@ -0,0 +1,106 @@
+# Copyright 2023 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 Dict
+
+from twisted.web.resource import Resource
+
+from synapse.rest.synapse.client import build_synapse_client_resource_tree
+
+from tests.unittest import HomeserverTestCase, override_config, skip_unless
+
+try:
+ import authlib # noqa: F401
+
+ HAS_AUTHLIB = True
+except ImportError:
+ HAS_AUTHLIB = False
+
+
+@skip_unless(HAS_AUTHLIB, "requires authlib")
+class JWKSTestCase(HomeserverTestCase):
+ """Test /_synapse/jwks JWKS data."""
+
+ def create_resource_dict(self) -> Dict[str, Resource]:
+ d = super().create_resource_dict()
+ d.update(build_synapse_client_resource_tree(self.hs))
+ return d
+
+ def test_empty_jwks(self) -> None:
+ """Test that the JWKS endpoint is not present by default."""
+ channel = self.make_request("GET", "/_synapse/jwks")
+ self.assertEqual(404, channel.code, channel.result)
+
+ @override_config(
+ {
+ "disable_registration": True,
+ "experimental_features": {
+ "msc3861": {
+ "enabled": True,
+ "issuer": "https://issuer/",
+ "client_id": "test-client-id",
+ "client_auth_method": "client_secret_post",
+ "client_secret": "secret",
+ },
+ },
+ }
+ )
+ def test_empty_jwks_for_msc3861_client_secret_post(self) -> None:
+ """Test that the JWKS endpoint is empty when plain auth is used."""
+ channel = self.make_request("GET", "/_synapse/jwks")
+ self.assertEqual(200, channel.code, channel.result)
+ self.assertEqual({"keys": []}, channel.json_body)
+
+ @override_config(
+ {
+ "disable_registration": True,
+ "experimental_features": {
+ "msc3861": {
+ "enabled": True,
+ "issuer": "https://issuer/",
+ "client_id": "test-client-id",
+ "client_auth_method": "private_key_jwt",
+ "jwk": {
+ "p": "-frVdP_tZ-J_nIR6HNMDq1N7aunwm51nAqNnhqIyuA8ikx7LlQED1tt2LD3YEvYyW8nxE2V95HlCRZXQPMiRJBFOsbmYkzl2t-MpavTaObB_fct_JqcRtdXddg4-_ihdjRDwUOreq_dpWh6MIKsC3UyekfkHmeEJg5YpOTL15j8",
+ "kty": "RSA",
+ "q": "oFw-Enr_YozQB1ab-kawn4jY3yHi8B1nSmYT0s8oTCflrmps5BFJfCkHL5ij3iY15z0o2m0N-jjB1oSJ98O4RayEEYNQlHnTNTl0kRIWzpoqblHUIxVcahIpP_xTovBJzwi8XXoLGqHOOMA-r40LSyVgP2Ut8D9qBwV6_UfT0LU",
+ "d": "WFkDPYo4b4LIS64D_QtQfGGuAObPvc3HFfp9VZXyq3SJR58XZRHE0jqtlEMNHhOTgbMYS3w8nxPQ_qVzY-5hs4fIanwvB64mAoOGl0qMHO65DTD_WsGFwzYClJPBVniavkLE2Hmpu8IGe6lGliN8vREC6_4t69liY-XcN_ECboVtC2behKkLOEASOIMuS7YcKAhTJFJwkl1dqDlliEn5A4u4xy7nuWQz3juB1OFdKlwGA5dfhDNglhoLIwNnkLsUPPFO-WB5ZNEW35xxHOToxj4bShvDuanVA6mJPtTKjz0XibjB36bj_nF_j7EtbE2PdGJ2KevAVgElR4lqS4ISgQ",
+ "e": "AQAB",
+ "kid": "test",
+ "qi": "cPfNk8l8W5exVNNea4d7QZZ8Qr8LgHghypYAxz8PQh1fNa8Ya1SNUDVzC2iHHhszxxA0vB9C7jGze8dBrvnzWYF1XvQcqNIVVgHhD57R1Nm3dj2NoHIKe0Cu4bCUtP8xnZQUN4KX7y4IIcgRcBWG1hT6DEYZ4BxqicnBXXNXAUI",
+ "dp": "dKlMHvslV1sMBQaKWpNb3gPq0B13TZhqr3-E2_8sPlvJ3fD8P4CmwwnOn50JDuhY3h9jY5L06sBwXjspYISVv8hX-ndMLkEeF3lrJeA5S70D8rgakfZcPIkffm3tlf1Ok3v5OzoxSv3-67Df4osMniyYwDUBCB5Oq1tTx77xpU8",
+ "dq": "S4ooU1xNYYcjl9FcuJEEMqKsRrAXzzSKq6laPTwIp5dDwt2vXeAm1a4eDHXC-6rUSZGt5PbqVqzV4s-cjnJMI8YYkIdjNg4NSE1Ac_YpeDl3M3Colb5CQlU7yUB7xY2bt0NOOFp9UJZYJrOo09mFMGjy5eorsbitoZEbVqS3SuE",
+ "n": "nJbYKqFwnURKimaviyDFrNLD3gaKR1JW343Qem25VeZxoMq1665RHVoO8n1oBm4ClZdjIiZiVdpyqzD5-Ow12YQgQEf1ZHP3CCcOQQhU57Rh5XvScTe5IxYVkEW32IW2mp_CJ6WfjYpfeL4azarVk8H3Vr59d1rSrKTVVinVdZer9YLQyC_rWAQNtHafPBMrf6RYiNGV9EiYn72wFIXlLlBYQ9Fx7bfe1PaL6qrQSsZP3_rSpuvVdLh1lqGeCLR0pyclA9uo5m2tMyCXuuGQLbA_QJm5xEc7zd-WFdux2eXF045oxnSZ_kgQt-pdN7AxGWOVvwoTf9am6mSkEdv6iw",
+ },
+ },
+ },
+ }
+ )
+ def test_key_returned_for_msc3861_client_secret_post(self) -> None:
+ """Test that the JWKS includes public part of JWK for private_key_jwt auth is used."""
+ channel = self.make_request("GET", "/_synapse/jwks")
+ self.assertEqual(200, channel.code, channel.result)
+ self.assertEqual(
+ {
+ "keys": [
+ {
+ "kty": "RSA",
+ "e": "AQAB",
+ "kid": "test",
+ "n": "nJbYKqFwnURKimaviyDFrNLD3gaKR1JW343Qem25VeZxoMq1665RHVoO8n1oBm4ClZdjIiZiVdpyqzD5-Ow12YQgQEf1ZHP3CCcOQQhU57Rh5XvScTe5IxYVkEW32IW2mp_CJ6WfjYpfeL4azarVk8H3Vr59d1rSrKTVVinVdZer9YLQyC_rWAQNtHafPBMrf6RYiNGV9EiYn72wFIXlLlBYQ9Fx7bfe1PaL6qrQSsZP3_rSpuvVdLh1lqGeCLR0pyclA9uo5m2tMyCXuuGQLbA_QJm5xEc7zd-WFdux2eXF045oxnSZ_kgQt-pdN7AxGWOVvwoTf9am6mSkEdv6iw",
+ }
+ ]
+ },
+ channel.json_body,
+ )
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