Fix `KeyError` in nest integration when the old key format does not exist (#130057)

* Fix bug in nest setup when the old key format does not exist

* Further simplify the entry.data check

* Update homeassistant/components/nest/api.py

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

---------

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

homeassistant/components/nest/api.py

@@ -114,9 +114,8 @@ async def new_subscriber(
         implementation, config_entry_oauth2_flow.LocalOAuth2Implementation
     ):
         raise TypeError(f"Unexpected auth implementation {implementation}")
-    subscription_name = entry.data.get(
-        CONF_SUBSCRIPTION_NAME, entry.data[CONF_SUBSCRIBER_ID]
-    )
+    if (subscription_name := entry.data.get(CONF_SUBSCRIPTION_NAME)) is None:
+        subscription_name = entry.data[CONF_SUBSCRIBER_ID]
     auth = AsyncConfigEntryAuth(
         aiohttp_client.async_get_clientsession(hass),
         config_entry_oauth2_flow.OAuth2Session(hass, entry, implementation),

tests/components/nest/common.py

@@ -30,6 +30,7 @@ CLIENT_ID = "some-client-id"
 CLIENT_SECRET = "some-client-secret"
 CLOUD_PROJECT_ID = "cloud-id-9876"
 SUBSCRIBER_ID = "projects/cloud-id-9876/subscriptions/subscriber-id-9876"
+SUBSCRIPTION_NAME = "projects/cloud-id-9876/subscriptions/subscriber-id-9876"
 
 
 @dataclass
@@ -86,6 +87,17 @@ TEST_CONFIG_ENTRY_LEGACY = NestTestConfig(
     },
 )
 
+TEST_CONFIG_NEW_SUBSCRIPTION = NestTestConfig(
+    config_entry_data={
+        "sdm": {},
+        "project_id": PROJECT_ID,
+        "cloud_project_id": CLOUD_PROJECT_ID,
+        "subscription_name": SUBSCRIPTION_NAME,
+        "auth_implementation": "imported-cred",
+    },
+    credential=ClientCredential(CLIENT_ID, CLIENT_SECRET),
+)
+
 
 class FakeSubscriber(GoogleNestSubscriber):
     """Fake subscriber that supplies a FakeDeviceManager."""

tests/components/nest/test_init.py

@@ -31,6 +31,7 @@ from .common import (
     SUBSCRIBER_ID,
     TEST_CONFIG_ENTRY_LEGACY,
     TEST_CONFIG_LEGACY,
+    TEST_CONFIG_NEW_SUBSCRIPTION,
     TEST_CONFIGFLOW_APP_CREDS,
     FakeSubscriber,
     PlatformSetup,
@@ -97,6 +98,19 @@ async def test_setup_success(
     assert entries[0].state is ConfigEntryState.LOADED
 
 
+@pytest.mark.parametrize("nest_test_config", [(TEST_CONFIG_NEW_SUBSCRIPTION)])
+async def test_setup_success_new_subscription_format(
+    hass: HomeAssistant, error_caplog: pytest.LogCaptureFixture, setup_platform
+) -> None:
+    """Test successful setup."""
+    await setup_platform()
+    assert not error_caplog.records
+
+    entries = hass.config_entries.async_entries(DOMAIN)
+    assert len(entries) == 1
+    assert entries[0].state is ConfigEntryState.LOADED
+
+
 @pytest.mark.parametrize("subscriber_id", [("invalid-subscriber-format")])
 async def test_setup_configuration_failure(
     hass: HomeAssistant,