chore: Add test_batch_eval to replay tests

PiperOrigin-RevId: 776231295

Author: jsondai

tests/unit/vertexai/genai/replays/test_batch_evaluate.py

@@ -0,0 +1,45 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# pylint: disable=protected-access,bad-continuation,missing-function-docstring
+
+from tests.unit.vertexai.genai.replays import pytest_helper
+from vertexai._genai import types
+
+
+def test_batch_eval(client):
+    eval_dataset = types.EvaluationDataset(
+        gcs_source=types.GcsSource(
+            uris=["gs://genai-eval-sdk-replay-test/test_data/inference_results.jsonl"]
+        )
+    )
+
+    batch_eval_operation = client.evals.batch_evaluate(
+        dataset=eval_dataset,
+        metrics=[
+            types.PrebuiltMetric.TEXT_QUALITY,
+        ],
+        dest="gs://genai-eval-sdk-replay-test/test_data/batch_eval_output",
+    )
+    assert "operations" in batch_eval_operation.name
+    assert "EvaluateDatasetOperationMetadata" in batch_eval_operation.metadata.get(
+        "@type"
+    )
+
+
+pytestmark = pytest_helper.setup(
+    file=__file__,
+    globals_for_file=globals(),
+    test_method="evals.batch_evaluate",
+)

vertexai/_genai/_evals_utils.py

@@ -182,7 +182,7 @@ def read_file_contents(self, gcs_filepath: str) -> str:
             )
         bucket = self.storage_client.bucket(bucket_name)
         blob = bucket.blob(blob_path)
-        content = blob.download_as_string().decode("utf-8")
+        content = blob.download_as_bytes().decode("utf-8")
         logger.info(f"Successfully read content from '{gcs_filepath}'")
         return content