diff --git a/tests/handlers/test_saml.py b/tests/handlers/test_saml.py
new file mode 100644
index 0000000000..79fd47036f
--- /dev/null
+++ b/tests/handlers/test_saml.py
@@ -0,0 +1,136 @@
+# Copyright 2020 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.
+
+import attr
+
+from synapse.handlers.sso import MappingException
+
+from tests.unittest import HomeserverTestCase
+
+# These are a few constants that are used as config parameters in the tests.
+BASE_URL = "https://synapse/"
+
+
+@attr.s
+class FakeAuthnResponse:
+ ava = attr.ib(type=dict)
+
+
+class TestMappingProvider:
+ def __init__(self, config, module):
+ pass
+
+ @staticmethod
+ def parse_config(config):
+ return
+
+ @staticmethod
+ def get_saml_attributes(config):
+ return {"uid"}, {"displayName"}
+
+ def get_remote_user_id(self, saml_response, client_redirect_url):
+ return saml_response.ava["uid"]
+
+ def saml_response_to_user_attributes(
+ self, saml_response, failures, client_redirect_url
+ ):
+ localpart = saml_response.ava["username"] + (str(failures) if failures else "")
+ return {"mxid_localpart": localpart, "displayname": None}
+
+
+class SamlHandlerTestCase(HomeserverTestCase):
+ def default_config(self):
+ config = super().default_config()
+ config["public_baseurl"] = BASE_URL
+ saml_config = {
+ "sp_config": {"metadata": {}},
+ # Disable grandfathering.
+ "grandfathered_mxid_source_attribute": None,
+ "user_mapping_provider": {"module": __name__ + ".TestMappingProvider"},
+ }
+ config["saml2_config"] = saml_config
+
+ return config
+
+ def make_homeserver(self, reactor, clock):
+ hs = self.setup_test_homeserver()
+
+ self.handler = hs.get_saml_handler()
+
+ # Reduce the number of attempts when generating MXIDs.
+ sso_handler = hs.get_sso_handler()
+ sso_handler._MAP_USERNAME_RETRIES = 3
+
+ return hs
+
+ def test_map_saml_response_to_user(self):
+ """Ensure that mapping the SAML response returned from a provider to an MXID works properly."""
+ saml_response = FakeAuthnResponse({"uid": "test_user", "username": "test_user"})
+ # The redirect_url doesn't matter with the default user mapping provider.
+ redirect_url = ""
+ mxid = self.get_success(
+ self.handler._map_saml_response_to_user(
+ saml_response, redirect_url, "user-agent", "10.10.10.10"
+ )
+ )
+ self.assertEqual(mxid, "@test_user:test")
+
+ def test_map_saml_response_to_invalid_localpart(self):
+ """If the mapping provider generates an invalid localpart it should be rejected."""
+ saml_response = FakeAuthnResponse({"uid": "test", "username": "föö"})
+ redirect_url = ""
+ e = self.get_failure(
+ self.handler._map_saml_response_to_user(
+ saml_response, redirect_url, "user-agent", "10.10.10.10"
+ ),
+ MappingException,
+ )
+ self.assertEqual(str(e.value), "localpart is invalid: föö")
+
+ def test_map_saml_response_to_user_retries(self):
+ """The mapping provider can retry generating an MXID if the MXID is already in use."""
+ store = self.hs.get_datastore()
+ self.get_success(
+ store.register_user(user_id="@test_user:test", password_hash=None)
+ )
+ saml_response = FakeAuthnResponse({"uid": "test", "username": "test_user"})
+ redirect_url = ""
+ mxid = self.get_success(
+ self.handler._map_saml_response_to_user(
+ saml_response, redirect_url, "user-agent", "10.10.10.10"
+ )
+ )
+ # test_user is already taken, so test_user1 gets registered instead.
+ self.assertEqual(mxid, "@test_user1:test")
+
+ # Register all of the potential mxids for a particular SAML username.
+ self.get_success(
+ store.register_user(user_id="@tester:test", password_hash=None)
+ )
+ for i in range(1, 3):
+ self.get_success(
+ store.register_user(user_id="@tester%d:test" % i, password_hash=None)
+ )
+
+ # Now attempt to map to a username, this will fail since all potential usernames are taken.
+ saml_response = FakeAuthnResponse({"uid": "tester", "username": "tester"})
+ e = self.get_failure(
+ self.handler._map_saml_response_to_user(
+ saml_response, redirect_url, "user-agent", "10.10.10.10"
+ ),
+ MappingException,
+ )
+ self.assertEqual(
+ str(e.value), "Unable to generate a Matrix ID from the SSO response"
+ )
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