From d5d7d6483f5a00294df3491b3ba1f7c75a84b4ed Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 25 Oct 2026 02:39:24 +0000
Subject: [PATCH] test: cover dhtcluster interface address selection

Co-authored-by: aberaud <101827+aberaud@users.noreply.github.com>
---
 python/tests/dhtcluster_tests.py | 35 ++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 python/tests/dhtcluster_tests.py

diff --git a/python/tests/dhtcluster_tests.py b/python/tests/dhtcluster_tests.py
new file mode 100644
index 00000000..e3a30b73
--- /dev/null
+++ b/python/tests/dhtcluster_tests.py
@@ -0,0 +1,35 @@
+import runpy
+import unittest
+from pathlib import Path
+from unittest.mock import Mock, patch
+
+import netifaces
+
+
+class NodeClusterTester(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        script = Path(__file__).resolve().parents[1] / 'tools' / 'dhtcluster.py'
+        with patch.dict('sys.modules', {'opendht': Mock()}):
+            cls.NodeCluster = runpy.run_path(str(script))['NodeCluster']
+
+    def test_find_ip_interface(self):
+        addresses = {
+            netifaces.AF_INET: [{'addr': '127.0.0.1'}],
+            netifaces.AF_INET6: [{'addr': '::1'}],
+        }
+        with patch('netifaces.ifaddresses', return_value=addresses) as ifaddresses:
+            self.assertEqual(self.NodeCluster.find_ip('lo'), ('127.0.0.1', '::1'))
+        self.assertTrue(ifaddresses.called)
+        self.assertTrue(all(call.args == ('lo',) for call in ifaddresses.call_args_list))
+
+    def test_find_ip_any(self):
+        with patch('netifaces.ifaddresses') as ifaddresses:
+            for iface in (None, '', 'any'):
+                with self.subTest(iface=iface):
+                    self.assertEqual(self.NodeCluster.find_ip(iface), ('0.0.0.0', '::0'))
+        ifaddresses.assert_not_called()
+
+
+if __name__ == '__main__':
+    unittest.main()