fix: check if eval config file exists

PiperOrigin-RevId: 824709118

Author: ankursharmas

src/google/adk/evaluation/eval_config.py

@@ -15,6 +15,7 @@
 from __future__ import annotations
 
 import logging
+import os
 from typing import Optional
 from typing import Union
 
@@ -89,12 +90,14 @@ def get_evaluation_criteria_or_default(
 
   Otherwise a default one is returned.
   """
-  if eval_config_file_path:
+  if eval_config_file_path and os.path.exists(eval_config_file_path):
     with open(eval_config_file_path, "r", encoding="utf-8") as f:
       content = f.read()
       return EvalConfig.model_validate_json(content)
 
-  logger.info("No config file supplied. Using default criteria.")
+  logger.info(
+      "No config file supplied or file not found. Using default criteria."
+  )
   return _DEFAULT_EVAL_CONFIG
 
 

tests/unittests/evaluation/test_eval_config.py

@@ -27,6 +27,7 @@ def test_get_evaluation_criteria_or_default_returns_default():
 
 
 def test_get_evaluation_criteria_or_default_reads_from_file(mocker):
+  mocker.patch("os.path.exists", return_value=True)
   eval_config = EvalConfig(
       criteria={"tool_trajectory_avg_score": 0.5, "response_match_score": 0.5}
   )
@@ -36,6 +37,15 @@ def test_get_evaluation_criteria_or_default_reads_from_file(mocker):
   assert get_evaluation_criteria_or_default("dummy_path") == eval_config
 
 
+def test_get_evaluation_criteria_or_default_returns_default_if_file_not_found(
+    mocker,
+):
+  mocker.patch("os.path.exists", return_value=False)
+  assert (
+      get_evaluation_criteria_or_default("dummy_path") == _DEFAULT_EVAL_CONFIG
+  )
+
+
 def test_get_eval_metrics_from_config():
   rubric_1 = Rubric(
       rubric_id="test-rubric",