Ensure Schlage config entry uniqueness (#131732)

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

homeassistant/components/schlage/config_flow.py

@@ -40,6 +40,7 @@ class SchlageConfigFlow(ConfigFlow, domain=DOMAIN):
             return self._show_user_form(errors)
 
         await self.async_set_unique_id(user_id)
+        self._abort_if_unique_id_configured()
         return self.async_create_entry(
             title=username,
             data={

tests/components/schlage/test_config_flow.py

@@ -12,6 +12,8 @@ from homeassistant.data_entry_flow import FlowResultType
 
 from . import MockSchlageConfigEntry
 
+from tests.common import MockConfigEntry
+
 pytestmark = pytest.mark.usefixtures("mock_setup_entry")
 
 
@@ -54,6 +56,32 @@ async def test_form(
     assert len(mock_setup_entry.mock_calls) == 1
 
 
+async def test_form_requires_unique_id(
+    hass: HomeAssistant,
+    mock_added_config_entry: MockConfigEntry,
+    mock_pyschlage_auth: Mock,
+) -> None:
+    """Test entries have unique ids."""
+    init_result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+    assert init_result["type"] is FlowResultType.FORM
+    assert init_result["errors"] == {}
+
+    create_result = await hass.config_entries.flow.async_configure(
+        init_result["flow_id"],
+        {
+            "username": "test-username",
+            "password": "test-password",
+        },
+    )
+    await hass.async_block_till_done()
+
+    mock_pyschlage_auth.authenticate.assert_called_once_with()
+    assert create_result["type"] is FlowResultType.ABORT
+    assert create_result["reason"] == "already_configured"
+
+
 async def test_form_invalid_auth(
     hass: HomeAssistant, mock_pyschlage_auth: Mock
 ) -> None: