fix: Raise NotFoundError in list_eval_sets function when app_name doesn't exist

PiperOrigin-RevId: 784216832

src/google/adk/evaluation/eval_sets_manager.py

@@ -36,7 +36,11 @@ class EvalSetsManager(ABC):
 
   @abstractmethod
   def list_eval_sets(self, app_name: str) -> list[str]:
-    """Returns a list of EvalSets that belong to the given app_name."""
+    """Returns a list of EvalSets that belong to the given app_name.
+
+    Raises:
+      NotFoundError: If the app_name doesn't exist.
+    """
 
   @abstractmethod
   def get_eval_case(

src/google/adk/evaluation/gcs_eval_sets_manager.py

@@ -23,6 +23,7 @@ from google.cloud import exceptions as cloud_exceptions
 from google.cloud import storage
 from typing_extensions import override
 
+from ..errors.not_found_error import NotFoundError
 from ._eval_sets_manager_utils import add_eval_case_to_eval_set
 from ._eval_sets_manager_utils import delete_eval_case_from_eval_set
 from ._eval_sets_manager_utils import get_eval_case_from_eval_set
@@ -130,7 +131,7 @@ class GcsEvalSetsManager(EvalSetsManager):
         eval_sets.append(eval_set_id)
       return sorted(eval_sets)
     except cloud_exceptions.NotFound as e:
-      raise ValueError(
+      raise NotFoundError(
           f"App `{app_name}` not found in GCS bucket `{self.bucket_name}`."
       ) from e