🚧 WIP

backend/tests/test_api.py

@@ -180,6 +180,37 @@ def test_listener_management_and_preview(admin_client):
     assert delete.status_code == 204
 
 
+def test_listener_update_and_preview(admin_client):
+    listener_id = admin_client.post(
+        "/api/v1/broker/listeners",
+        json={"name": "Production MQTT", "port": 1883, "protocol": "mqtt"},
+    ).json()["id"]
+
+    updated = admin_client.put(
+        f"/api/v1/broker/listeners/{listener_id}",
+        json={
+            "name": "Production MQTT",
+            "port": 1884,
+            "bind_address": "127.0.0.1",
+            "protocol": "websockets",
+            "allow_anonymous": True,
+        },
+    )
+    assert updated.status_code == 200, updated.text
+    body = updated.json()
+    assert body["port"] == 1884
+    assert body["bind_address"] == "127.0.0.1"
+    assert body["protocol"] == "websockets"
+    assert body["allow_anonymous"] is True
+
+    config_text = admin_client.get("/api/v1/broker/config/preview").json()[
+        "config_text"
+    ]
+    assert "listener 1884 127.0.0.1" in config_text
+    assert "protocol websockets" in config_text
+    assert "listener_allow_anonymous true" in config_text
+
+
 def test_audit_events_recorded(admin_client, db_session):
     from sqlalchemy import select