Only allow single Home Connect config entry (#137088)

* Make Home Connect config entry unique

* Use unique ID for Home connect config entry

* Remove unnecessary code

* Revert "Use unique ID for Home connect config entry"

This reverts commit 4241317469.

* Added tests

homeassistant/components/home_connect/manifest.json

@@ -7,5 +7,6 @@
   "documentation": "https://www.home-assistant.io/integrations/home_connect",
   "iot_class": "cloud_push",
   "loggers": ["aiohomeconnect"],
-  "requirements": ["aiohomeconnect==0.12.3"]
+  "requirements": ["aiohomeconnect==0.12.3"],
+  "single_config_entry": true
 }

homeassistant/generated/integrations.json

@@ -2609,7 +2609,8 @@
       "name": "Home Connect",
       "integration_type": "hub",
       "config_flow": true,
-      "iot_class": "cloud_push"
+      "iot_class": "cloud_push",
+      "single_config_entry": true
     },
     "home_plus_control": {
       "name": "Legrand Home+ Control",

tests/components/home_connect/test_config_flow.py

@@ -16,6 +16,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
 from homeassistant.helpers import config_entry_oauth2_flow
 
+from tests.common import MockConfigEntry
 from tests.test_util.aiohttp import AiohttpClientMocker
 from tests.typing import ClientSessionGenerator
 
@@ -77,3 +78,18 @@ async def test_full_flow(
 
     assert len(hass.config_entries.async_entries(DOMAIN)) == 1
     assert len(mock_setup_entry.mock_calls) == 1
+
+
+async def test_prevent_multiple_config_entries(
+    hass: HomeAssistant,
+    config_entry: MockConfigEntry,
+) -> None:
+    """Test we only allow one config entry."""
+    config_entry.add_to_hass(hass)
+
+    result = await hass.config_entries.flow.async_init(
+        "home_connect", context={"source": config_entries.SOURCE_USER}
+    )
+
+    assert result["type"] == "abort"
+    assert result["reason"] == "single_instance_allowed"