diff --git a/tests/handlers/test_identity.py b/tests/handlers/test_identity.py
new file mode 100644
index 0000000000..99ce94db52
--- /dev/null
+++ b/tests/handlers/test_identity.py
@@ -0,0 +1,108 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 New Vector Ltd
+#
+# 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 mock import Mock
+
+from twisted.internet import defer
+
+import synapse.rest.admin
+from synapse.rest.client.v1 import login
+from synapse.rest.client.v2_alpha import account
+
+from tests import unittest
+
+
+class ThreepidISRewrittenURLTestCase(unittest.HomeserverTestCase):
+
+ servlets = [
+ synapse.rest.admin.register_servlets_for_client_rest_resource,
+ login.register_servlets,
+ account.register_servlets,
+ ]
+
+ def make_homeserver(self, reactor, clock):
+ self.address = "test@test"
+ self.is_server_name = "testis"
+ self.rewritten_is_url = "int.testis"
+
+ config = self.default_config()
+ config["trusted_third_party_id_servers"] = [
+ self.is_server_name,
+ ]
+ config["rewrite_identity_server_urls"] = {
+ self.is_server_name: self.rewritten_is_url,
+ }
+
+ mock_http_client = Mock(spec=[
+ "post_urlencoded_get_json",
+ ])
+ mock_http_client.post_urlencoded_get_json.return_value = defer.succeed({
+ "address": self.address,
+ "medium": "email",
+ })
+
+ self.hs = self.setup_test_homeserver(
+ config=config,
+ simple_http_client=mock_http_client,
+ )
+
+ return self.hs
+
+ def prepare(self, reactor, clock, hs):
+ self.user_id = self.register_user("kermit", "monkey")
+
+ def test_rewritten_id_server(self):
+ """
+ Tests that, when validating a 3PID association while rewriting the IS's server
+ name:
+ * the bind request is done against the rewritten hostname
+ * the original, non-rewritten, server name is stored in the database
+ """
+ handler = self.hs.get_handlers().identity_handler
+ post_urlenc_get_json = self.hs.get_simple_http_client().post_urlencoded_get_json
+ store = self.hs.get_datastore()
+
+ creds = {
+ "sid": "123",
+ "client_secret": "some_secret",
+ }
+
+ # Make sure processing the mocked response goes through.
+ data = self.get_success(handler.bind_threepid(
+ {
+ "id_server": self.is_server_name,
+ "client_secret": creds["client_secret"],
+ "sid": creds["sid"],
+ },
+ self.user_id,
+ ))
+ self.assertEqual(data.get("address"), self.address)
+
+ # Check that the request was done against the rewritten server name.
+ post_urlenc_get_json.assert_called_once_with(
+ "https://%s/_matrix/identity/api/v1/3pid/bind" % self.rewritten_is_url,
+ {
+ 'sid': creds['sid'],
+ 'client_secret': creds["client_secret"],
+ 'mxid': self.user_id,
+ }
+ )
+
+ # Check that the original server name is saved in the database instead of the
+ # rewritten one.
+ id_servers = self.get_success(store.get_id_servers_user_bound(
+ self.user_id, "email", self.address
+ ))
+ self.assertEqual(id_servers, [self.is_server_name])
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