Fix Google Tasks error handling on DNS failure (#182195)

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

homeassistant/components/google_tasks/api.py

@@ -152,9 +152,13 @@ class AsyncConfigEntryAuth:
     async def _execute(self, request: HttpRequest | BatchHttpRequest) -> Any:
         try:
             result = await self._hass.async_add_executor_job(request.execute)
-        except (HttpError, ServerNotFoundError) as err:
+        except HttpError as err:
             raise GoogleTasksApiError(
-                f"Google Tasks API responded with: {err.reason or err.status_code})"
+                f"Google Tasks API responded with: {err.reason or err.status_code}"
+            ) from err
+        except ServerNotFoundError as err:
+            raise GoogleTasksApiError(
+                f"Unable to reach the Google Tasks API: {err}"
             ) from err
         if result:
             _raise_if_error(result)

tests/components/google_tasks/test_init.py

@@ -8,7 +8,7 @@ import time
 from unittest.mock import Mock, patch
 
 from aiohttp import ClientError
-from httplib2 import Response
+from httplib2 import Response, ServerNotFoundError
 import pytest
 
 from homeassistant.components.google_tasks import DOMAIN
@@ -131,16 +131,23 @@ async def test_expired_token_refresh_failure(
 @pytest.mark.parametrize(
     "response_handler",
     [
-        ([(Response({"status": HTTPStatus.INTERNAL_SERVER_ERROR}), b"")]),
-        # First request succeeds, second request fails
-        (
+        pytest.param(
+            [(Response({"status": HTTPStatus.INTERNAL_SERVER_ERROR}), b"")],
+            id="first_request_fails",
+        ),
+        pytest.param(
             [
                 (
                     Response({"status": HTTPStatus.OK}),
                     json.dumps(LIST_TASK_LIST_RESPONSE),
                 ),
                 (Response({"status": HTTPStatus.INTERNAL_SERVER_ERROR}), b""),
-            ]
+            ],
+            id="second_request_fails",
+        ),
+        pytest.param(
+            [ServerNotFoundError("Unable to find the server at tasks.googleapis.com")],
+            id="server_not_found",
         ),
     ],
 )