chore(dataset): basic house-keeping (#3170)

tests/configs/test_default.py

@@ -0,0 +1,38 @@
+# Copyright 2026 The HuggingFace Inc. team. 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 lerobot.configs.default import DatasetConfig
+
+
+def test_dataset_config_valid():
+    DatasetConfig(repo_id="user/repo", episodes=[0, 1, 2])
+
+
+def test_dataset_config_negative_episodes():
+    with pytest.raises(ValueError, match="non-negative"):
+        DatasetConfig(repo_id="user/repo", episodes=[0, -1, 2])
+
+
+def test_dataset_config_duplicate_episodes():
+    with pytest.raises(ValueError, match="duplicates"):
+        DatasetConfig(repo_id="user/repo", episodes=[0, 1, 1, 2])
+
+
+def test_dataset_config_none_episodes_ok():
+    DatasetConfig(repo_id="user/repo", episodes=None)
+
+
+def test_dataset_config_empty_episodes_ok():
+    DatasetConfig(repo_id="user/repo", episodes=[])