diff --git a/backend/open_webui/test/util/test_knowledge_collections.py b/backend/open_webui/test/util/test_knowledge_collections.py
deleted file mode 100644
index ede7488df8..0000000000
--- a/backend/open_webui/test/util/test_knowledge_collections.py
+++ /dev/null
@@ -1,86 +0,0 @@
-import asyncio
-from types import SimpleNamespace
-
-from open_webui.utils.knowledge_collections import reindex_file_in_collection
-
-
-def test_reindex_file_in_collection_deletes_old_ids_only_after_success():
-    calls = []
-
-    class DummyVectorDB:
-        async def query(self, collection_name, filter, limit=None):
-            calls.append(('query', collection_name, filter))
-            return SimpleNamespace(ids=[['old-1', 'old-2']])
-
-        async def delete(self, collection_name, ids=None, filter=None):
-            calls.append(('delete', collection_name, ids, filter))
-
-    async def fake_process_file(request, form, user, db):
-        calls.append(('process_file', form.file_id, form.collection_name))
-
-    class DummyProcessFileForm:
-        def __init__(self, file_id, collection_name=None):
-            self.file_id = file_id
-            self.collection_name = collection_name
-
-    asyncio.run(
-        reindex_file_in_collection(
-            request=object(),
-            file_id='file-1',
-            collection_name='kb-1',
-            user=object(),
-            db=None,
-            process_file_form_factory=DummyProcessFileForm,
-            process_file_func=fake_process_file,
-            vector_db_client=DummyVectorDB(),
-        )
-    )
-
-    assert calls == [
-        ('query', 'kb-1', {'file_id': 'file-1'}),
-        ('process_file', 'file-1', 'kb-1'),
-        ('delete', 'kb-1', ['old-1', 'old-2'], None),
-    ]
-
-
-def test_reindex_file_in_collection_preserves_old_ids_when_rebuild_fails():
-    calls = []
-
-    class DummyVectorDB:
-        async def query(self, collection_name, filter, limit=None):
-            calls.append(('query', collection_name, filter))
-            return SimpleNamespace(ids=[['old-1']])
-
-        async def delete(self, collection_name, ids=None, filter=None):
-            calls.append(('delete', collection_name, ids, filter))
-
-    async def fake_process_file(request, form, user, db):
-        calls.append(('process_file', form.file_id, form.collection_name))
-        raise RuntimeError('reindex failed')
-
-    class DummyProcessFileForm:
-        def __init__(self, file_id, collection_name=None):
-            self.file_id = file_id
-            self.collection_name = collection_name
-
-    try:
-        asyncio.run(
-            reindex_file_in_collection(
-                request=object(),
-                file_id='file-1',
-                collection_name='kb-1',
-                user=object(),
-                db=None,
-                process_file_form_factory=DummyProcessFileForm,
-                process_file_func=fake_process_file,
-                vector_db_client=DummyVectorDB(),
-            )
-        )
-        raise AssertionError('Expected reindex_file_in_collection to raise RuntimeError')
-    except RuntimeError as exc:
-        assert str(exc) == 'reindex failed'
-
-    assert calls == [
-        ('query', 'kb-1', {'file_id': 'file-1'}),
-        ('process_file', 'file-1', 'kb-1'),
-    ]