Test: add sdk Dataset test cases (#8077)

### What problem does this PR solve?

Add sdk dataset test cases

### Type of change

- [x] Add test case

test/testcases/test_sdk_api/conftest.py

@@ -0,0 +1,45 @@
+#
+#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
+#
+#  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.
+#
+
+import pytest
+from common import (
+    batch_create_datasets,
+)
+from configs import HOST_ADDRESS, VERSION
+from ragflow_sdk import RAGFlow
+
+
+@pytest.fixture(scope="session")
+def client(token):
+    return RAGFlow(api_key=token, base_url=HOST_ADDRESS, version=VERSION)
+
+
+@pytest.fixture(scope="function")
+def clear_datasets(request, client):
+    def cleanup():
+        client.delete_datasets(ids=None)
+
+    request.addfinalizer(cleanup)
+
+
+@pytest.fixture(scope="function")
+def add_dataset_func(request, client):
+    def cleanup():
+        client.delete_datasets(ids=None)
+
+    request.addfinalizer(cleanup)
+
+    return batch_create_datasets(client, 1)[0]