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-rw-r--r--tests/test_server.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/test_server.py b/tests/test_server.py
index d67d7722a4..e266c06a2c 100644
--- a/tests/test_server.py
+++ b/tests/test_server.py
@@ -266,6 +266,10 @@ class OptionsResourceTests(unittest.TestCase):
             [b"X-Requested-With, Content-Type, Authorization, Date"],
             "has correct CORS Headers header",
         )
+        self.assertEqual(
+            channel.headers.getRawHeaders(b"Access-Control-Expose-Headers"),
+            [b"Synapse-Trace-Id"],
+        )
 
     def _check_cors_msc3886_headers(self, channel: FakeChannel) -> None:
         # Ensure the correct CORS headers have been added