diff --git a/tests/test_config_flow_ux.py b/tests/test_config_flow_ux.py
index 1c6876e..e6011a6 100644
--- a/tests/test_config_flow_ux.py
+++ b/tests/test_config_flow_ux.py
@@ -960,6 +960,15 @@ class TestProtocolReconfigure:
         assert hass.config_entries.reloaded_entry_ids == ["e1"]
         assert client.finished_codes == [FAKE_PAIRING_CODE]
 
+        # ...and the reloaded entry can really build the transport again: the
+        # settings point at the paired certificate + the address just paired,
+        # which is exactly what was impossible before reconfigure existed.
+        init = _integration_module()
+        settings = await init._build_protocol_settings(hass, entry)
+        assert settings is not None
+        assert settings["host"] == "10.0.0.9"
+        assert settings["certfile"].endswith("client.pem")
+
     async def test_reconfigure_host_correction_reopens_the_pin_step(
         self, tmp_path, monkeypatch
     ):