Fix config flow validation in Nord Pool (#169751)

homeassistant/components/nordpool/config_flow.py

@@ -56,6 +56,8 @@ DATA_SCHEMA = vol.Schema(
 
 async def test_api(hass: HomeAssistant, user_input: dict[str, Any]) -> dict[str, str]:
     """Test fetch data from Nord Pool."""
+    if not user_input.get(CONF_AREAS):
+        return {CONF_AREAS: "no_areas"}
     client = NordPoolClient(async_get_clientsession(hass))
     try:
         await client.async_get_delivery_period(

homeassistant/components/nordpool/strings.json

@@ -5,6 +5,7 @@
     },
     "error": {
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
+      "no_areas": "No area(s) selected",
       "no_data": "API connected but the response was empty"
     },
     "step": {

tests/components/nordpool/test_config_flow.py

@@ -107,6 +107,39 @@ async def test_cannot_connect(
     assert result["data"] == {"areas": ["SE3", "SE4"], "currency": "SEK"}
 
 
+@pytest.mark.freeze_time("2025-10-01T18:00:00+00:00")
+async def test_missing_areas(
+    hass: HomeAssistant,
+    get_client: NordPoolClient,
+) -> None:
+    """Test cannot connect error."""
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == config_entries.SOURCE_USER
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        user_input={
+            CONF_CURRENCY: "SEK",
+        },
+    )
+
+    assert result["errors"] == {CONF_AREAS: "no_areas"}
+
+    result = await hass.config_entries.flow.async_configure(
+        result["flow_id"],
+        user_input=ENTRY_CONFIG,
+    )
+
+    assert result["type"] is FlowResultType.CREATE_ENTRY
+    assert result["title"] == "Nord Pool"
+    assert result["data"] == {"areas": ["SE3", "SE4"], "currency": "SEK"}
+
+
 @pytest.mark.freeze_time("2025-10-01T18:00:00+00:00")
 async def test_reconfigure(
     hass: HomeAssistant,