diff --git a/jupyterhub/tests/test_proxy.py b/jupyterhub/tests/test_proxy.py
index e8cbfa92..1c0cf12d 100644
--- a/jupyterhub/tests/test_proxy.py
+++ b/jupyterhub/tests/test_proxy.py
@@ -154,6 +154,8 @@ def test_external_proxy(request):
     'zoe',
     '50fia',
     '秀樹',
+    '~TestJH',
+    'has@',
 ])
 def test_check_routes(app,  username, disable_check_routes):
     proxy = app.proxy