Update test_config_flow.py

tests/components/niko_home_control/test_config_flow.py

@@ -184,3 +184,29 @@ async def test_reconfigure(
     )
     await hass.async_block_till_done()
     assert result["type"] is FlowResultType.CREATE_ENTRY
+
+
+async def test_cannot_connect_after_reconfigure(
+    hass: HomeAssistant,
+    mock_setup_entry: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test the cannot connect error."""
+    mock_config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    result = await mock_config_entry.start_reconfigure_flow(hass)
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["errors"] == {}
+
+    with patch(
+        "homeassistant.components.niko_home_control.config_flow.NHCController.connect",
+        side_effect=Exception,
+    ):
+        result = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {CONF_HOST: "192.168.0.122"},
+        )
+    assert result["errors"] == {"base": "cannot_connect"}