🚧 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
 

backend/tests/test_configgen.py

@@ -46,9 +46,12 @@ def test_generate_includes_global_settings(session):
     assert "max_packet_size 2000000" in result.config_text
 
 
-def test_generate_refuses_without_listeners(session):
-    with pytest.raises(ValueError, match="no enabled listeners"):
-        generate_config(session)
+def test_generate_with_empty_model_warns_instead_of_raising(session):
+    """Fresh-platform state: preview must work, not 500 (config page fix)."""
+    result = generate_config(session)
+    assert "global_plugin /usr/lib/mosquitto_dynamic_security.so" in result.config_text
+    assert "persistence true" in result.config_text
+    assert any("No enabled listeners" in w for w in result.warnings)
 
 
 def test_disabled_listeners_are_omitted(session):