diff --git a/tests/test_router/test_utils.py b/tests/test_router/test_utils.py
index 457b812..55b837f 100644
--- a/tests/test_router/test_utils.py
+++ b/tests/test_router/test_utils.py
@@ -20,6 +20,16 @@ class ProcessForHostnameTestCase(BaseTestCase):
         self.assertIsNone(proc.poll())
         self.assertEqual(utils.get_process_for_hostname("localhost").pid, proc.pid)
 
+    def test_finds_process_with_multiple_hostnames(self):
+        proc = subprocess.Popen(
+            "yes",
+            stdout=subprocess.PIPE,
+            env={**os.environ, utils.HOSTNAME_ENV_VAR: "localhost,test.local"},
+        )
+        self.assertIsNone(proc.poll())
+        self.assertEqual(utils.get_process_for_hostname("localhost").pid, proc.pid)
+        self.assertEqual(utils.get_process_for_hostname("test.local").pid, proc.pid)
+
 
 class HostnameFromRequestTestCase(BaseTestCase):
     def get_request_for_hostname(self, hostname):