Only allow a single duotecno config entry (#102478)

homeassistant/components/duotecno/config_flow.py

@@ -34,6 +34,9 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         self, user_input: dict[str, Any] | None = None
     ) -> FlowResult:
         """Handle the initial step."""
+        if self._async_current_entries():
+            return self.async_abort(reason="single_instance_allowed")
+
         errors: dict[str, str] = {}
         if user_input is not None:
             try:

homeassistant/components/duotecno/strings.json

@@ -12,7 +12,8 @@
     "error": {
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
       "invalid_auth": "[%key:common::config_flow::error::invalid_auth%]",
-      "unknown": "[%key:common::config_flow::error::unknown%]"
+      "unknown": "[%key:common::config_flow::error::unknown%]",
+      "single_instance_allowed": "[%key:common::config_flow::abort::single_instance_allowed%]"
     }
   },
   "entity": {

tests/components/duotecno/test_config_flow.py

@@ -9,6 +9,8 @@ from homeassistant.components.duotecno.const import DOMAIN
 from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
 
+from tests.common import MockConfigEntry
+
 pytestmark = pytest.mark.usefixtures("mock_setup_entry")
 
 
@@ -87,3 +89,20 @@ async def test_invalid(hass: HomeAssistant, test_side_effect, test_error):
         "port": 1234,
         "password": "test-password2",
     }
+
+
+async def test_already_setup(hass: HomeAssistant, mock_setup_entry: AsyncMock) -> None:
+    """Test duoteco flow - already setup."""
+    entry = MockConfigEntry(
+        domain=DOMAIN,
+        unique_id="duotecno_1234",
+        data={},
+    )
+    entry.add_to_hass(hass)
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    assert result["type"] == FlowResultType.ABORT
+    assert result["reason"] == "single_instance_allowed"