Create test_dataset_client.py

tests/test_dataset_client.py

@@ -0,0 +1,15 @@
+import os
+from src.dataset_client import DatasetAPIClient
+
+def test_client_init():
+    client = DatasetAPIClient(dataset="PeacebinfLow/mindseye-lab-ledger")
+    assert client.dataset
+
+# NOTE:
+# Network tests are optional because HF Spaces CI doesn't always run pytest.
+# If you run locally, you can uncomment these.
+
+# def test_list_splits_live():
+#     client = DatasetAPIClient(dataset="PeacebinfLow/mindseye-lab-ledger")
+#     splits = client.list_splits()
+#     assert isinstance(splits, list)