Reconnect after config changes

tests/test_interfaces.py

@@ -0,0 +1,26 @@
+from argparse import Namespace
+import unittest
+from unittest import mock
+
+from contact.utilities.interfaces import reconnect_interface
+
+
+class InterfacesTests(unittest.TestCase):
+    def test_reconnect_interface_retries_until_connection_succeeds(self) -> None:
+        args = Namespace()
+
+        with mock.patch("contact.utilities.interfaces.initialize_interface", side_effect=[None, None, "iface"]) as initialize:
+            with mock.patch("contact.utilities.interfaces.time.sleep") as sleep:
+                result = reconnect_interface(args, attempts=3, delay_seconds=0.25)
+
+        self.assertEqual(result, "iface")
+        self.assertEqual(initialize.call_count, 3)
+        self.assertEqual(sleep.call_count, 2)
+
+    def test_reconnect_interface_raises_after_exhausting_attempts(self) -> None:
+        args = Namespace()
+
+        with mock.patch("contact.utilities.interfaces.initialize_interface", return_value=None):
+            with mock.patch("contact.utilities.interfaces.time.sleep"):
+                with self.assertRaises(RuntimeError):
+                    reconnect_interface(args, attempts=2, delay_seconds=0)