diff --git a/tests/test_types.py b/tests/test_types.py
index 0f5c8bfaf9..d314a7ff58 100644
--- a/tests/test_types.py
+++ b/tests/test_types.py
@@ -14,7 +14,7 @@
# limitations under the License.
from synapse.api.errors import SynapseError
-from synapse.types import GroupID, RoomAlias, UserID
+from synapse.types import GroupID, RoomAlias, UserID, map_username_to_mxid_localpart
from tests import unittest
from tests.utils import TestHomeServer
@@ -79,3 +79,32 @@ class GroupIDTestCase(unittest.TestCase):
except SynapseError as exc:
self.assertEqual(400, exc.code)
self.assertEqual("M_UNKNOWN", exc.errcode)
+
+
+class MapUsernameTestCase(unittest.TestCase):
+ def testPassThrough(self):
+ self.assertEqual(map_username_to_mxid_localpart("test1234"), "test1234")
+
+ def testUpperCase(self):
+ self.assertEqual(map_username_to_mxid_localpart("tEST_1234"), "test_1234")
+ self.assertEqual(
+ map_username_to_mxid_localpart("tEST_1234", case_sensitive=True),
+ "t_e_s_t__1234",
+ )
+
+ def testSymbols(self):
+ self.assertEqual(
+ map_username_to_mxid_localpart("test=$?_1234"),
+ "test=3d=24=3f_1234",
+ )
+
+ def testLeadingUnderscore(self):
+ self.assertEqual(map_username_to_mxid_localpart("_test_1234"), "=5ftest_1234")
+
+ def testNonAscii(self):
+ # this should work with either a unicode or a bytes
+ self.assertEqual(map_username_to_mxid_localpart(u'têst'), "t=c3=aast")
+ self.assertEqual(
+ map_username_to_mxid_localpart(u'têst'.encode('utf-8')),
+ "t=c3=aast",
+ )
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