Allow only single instance of energyzero integration (#133443)

homeassistant/components/energyzero/manifest.json

@@ -4,6 +4,8 @@
   "codeowners": ["@klaasnicolaas"],
   "config_flow": true,
   "documentation": "https://www.home-assistant.io/integrations/energyzero",
+  "integration_type": "service",
   "iot_class": "cloud_polling",
-  "requirements": ["energyzero==2.1.1"]
+  "requirements": ["energyzero==2.1.1"],
+  "single_config_entry": true
 }

homeassistant/generated/integrations.json

@@ -1653,9 +1653,10 @@
     },
     "energyzero": {
       "name": "EnergyZero",
-      "integration_type": "hub",
+      "integration_type": "service",
       "config_flow": true,
-      "iot_class": "cloud_polling"
+      "iot_class": "cloud_polling",
+      "single_config_entry": true
     },
     "enigma2": {
       "name": "Enigma2 (OpenWebif)",

tests/components/energyzero/test_config_flow.py

@@ -9,6 +9,8 @@ from homeassistant.config_entries import SOURCE_USER
 from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
 
+from tests.common import MockConfigEntry
+
 
 async def test_full_user_flow(
     hass: HomeAssistant,
@@ -33,3 +35,18 @@ async def test_full_user_flow(
     assert result2 == snapshot
 
     assert len(mock_setup_entry.mock_calls) == 1
+
+
+async def test_single_instance(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test abort when setting up a duplicate entry."""
+    mock_config_entry.add_to_hass(hass)
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": SOURCE_USER}
+    )
+
+    assert result.get("type") is FlowResultType.ABORT
+    assert result.get("reason") == "single_instance_allowed"