diff --git a/surfsense_backend/tests/unit/indexing_pipeline/test_persist_scratch_index.py b/surfsense_backend/tests/unit/indexing_pipeline/test_persist_scratch_index.py
new file mode 100644
index 000000000..026c3161d
--- /dev/null
+++ b/surfsense_backend/tests/unit/indexing_pipeline/test_persist_scratch_index.py
@@ -0,0 +1,65 @@
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from app.db import Chunk, Document, DocumentStatus
+from app.indexing_pipeline.document_persistence import persist_scratch_index
+
+pytestmark = pytest.mark.unit
+
+
+def _make_document(doc_id: int = 1) -> Document:
+    document = MagicMock(spec=Document)
+    document.id = doc_id
+    document.content = None
+    document.status = DocumentStatus.processing()
+    return document
+
+
+@pytest.mark.asyncio
+async def test_persist_scratch_index_batches_commits(monkeypatch):
+    monkeypatch.setattr(
+        "app.indexing_pipeline.document_persistence.set_committed_value",
+        lambda *_args, **_kwargs: None,
+    )
+    session = MagicMock()
+    session.commit = AsyncMock()
+    document = _make_document()
+    chunks = [Chunk(content=f"c{i}", embedding=[0.1], position=i) for i in range(5)]
+    perf = MagicMock()
+
+    await persist_scratch_index(
+        session,
+        document,
+        "body",
+        chunks,
+        batch_size=2,
+        perf=perf,
+    )
+
+    assert session.commit.await_count == 5
+    assert document.status == DocumentStatus.ready()
+
+
+@pytest.mark.asyncio
+async def test_persist_scratch_index_empty_chunks(monkeypatch):
+    monkeypatch.setattr(
+        "app.indexing_pipeline.document_persistence.set_committed_value",
+        lambda *_args, **_kwargs: None,
+    )
+    session = MagicMock()
+    session.commit = AsyncMock()
+    document = _make_document()
+    perf = MagicMock()
+
+    await persist_scratch_index(
+        session,
+        document,
+        "body",
+        [],
+        batch_size=200,
+        perf=perf,
+    )
+
+    assert session.commit.await_count == 2
+    assert document.status == DocumentStatus.ready()