fix: surface missing knowledge files

digital-avatar-app/backend/tests/test_knowledge_storage.py

@@ -0,0 +1,23 @@
+from pathlib import Path
+from types import SimpleNamespace
+from unittest.mock import patch
+
+from routers.knowledge import _doc_payload
+
+
+def test_doc_payload_reports_whether_the_persisted_file_exists(tmp_path: Path):
+    avatar_id = "avatar-1"
+    stored_name = "knowledge.md"
+    doc = SimpleNamespace(
+        avatar_id=avatar_id,
+        file_url=f"/api/files/{avatar_id}/{stored_name}",
+        to_dict=lambda: {"id": "doc-1", "fileUrl": f"/api/files/{avatar_id}/{stored_name}"},
+    )
+    stored_dir = tmp_path / avatar_id
+    stored_dir.mkdir()
+    stored_file = stored_dir / stored_name
+
+    with patch("routers.knowledge.UPLOAD_DIR", str(tmp_path)):
+        assert _doc_payload(doc)["filePresent"] is False
+        stored_file.write_text("knowledge", encoding="utf-8")
+        assert _doc_payload(doc)["filePresent"] is True