Handle Oauth2 ImplementationUnavailableError in google_sheets (#166651)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

homeassistant/components/google_sheets/__init__.py

@@ -15,6 +15,7 @@ from homeassistant.exceptions import (
 )
 from homeassistant.helpers import config_validation as cv
 from homeassistant.helpers.config_entry_oauth2_flow import (
+    ImplementationUnavailableError,
     OAuth2Session,
     async_get_config_entry_implementation,
 )
@@ -40,7 +41,13 @@ async def async_setup_entry(
     hass: HomeAssistant, entry: GoogleSheetsConfigEntry
 ) -> bool:
     """Set up Google Sheets from a config entry."""
-    implementation = await async_get_config_entry_implementation(hass, entry)
+    try:
+        implementation = await async_get_config_entry_implementation(hass, entry)
+    except ImplementationUnavailableError as err:
+        raise ConfigEntryNotReady(
+            translation_domain=DOMAIN,
+            translation_key="oauth2_implementation_unavailable",
+        ) from err
     session = OAuth2Session(hass, entry, implementation)
     try:
         await session.async_ensure_token_valid()

homeassistant/components/google_sheets/strings.json

@@ -42,6 +42,11 @@
       }
     }
   },
+  "exceptions": {
+    "oauth2_implementation_unavailable": {
+      "message": "[%key:common::exceptions::oauth2_implementation_unavailable::message%]"
+    }
+  },
   "services": {
     "append_sheet": {
       "description": "Appends data to a worksheet in Google Sheets.",

tests/components/google_sheets/test_init.py

@@ -35,6 +35,9 @@ from homeassistant.exceptions import (
     OAuth2TokenRequestTransientError,
     ServiceValidationError,
 )
+from homeassistant.helpers.config_entry_oauth2_flow import (
+    ImplementationUnavailableError,
+)
 from homeassistant.setup import async_setup_component
 
 from tests.common import MockConfigEntry
@@ -558,3 +561,20 @@ async def test_get_sheet_invalid_worksheet(
                 blocking=True,
                 return_response=True,
             )
+
+
+async def test_oauth_implementation_not_available(
+    hass: HomeAssistant,
+    config_entry: MockConfigEntry,
+) -> None:
+    """Test that unavailable OAuth implementation raises ConfigEntryNotReady."""
+    config_entry.add_to_hass(hass)
+
+    with patch(
+        "homeassistant.components.google_sheets.async_get_config_entry_implementation",
+        side_effect=ImplementationUnavailableError,
+    ):
+        await hass.config_entries.async_setup(config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    assert config_entry.state is ConfigEntryState.SETUP_RETRY