test: add document hashing unit tests and clean up conftest mocks

surfsense_backend/tests/unit/conftest.py

@@ -1,49 +1,3 @@
-from unittest.mock import AsyncMock, MagicMock
-
-import pytest
-
-_EMBEDDING_DIM = 4  # keep vectors tiny in tests; real model uses 768+
-
-
-@pytest.fixture
-def mock_session() -> AsyncMock:
-    session = AsyncMock()
-    session.add = MagicMock()  # synchronous in real SQLAlchemy
-    session.execute = AsyncMock()
-    session.scalar = AsyncMock()
-    session.scalars = AsyncMock()
-    session.flush = AsyncMock()
-    session.commit = AsyncMock()
-    session.rollback = AsyncMock()
-    session.refresh = AsyncMock()
-    return session
-
-
-@pytest.fixture
-def mock_llm() -> AsyncMock:
-    llm = AsyncMock()
-    llm.ainvoke = AsyncMock(return_value=MagicMock(content="Mocked summary."))
-    return llm
-
-
-@pytest.fixture
-def mock_embedding_model() -> MagicMock:
-    model = MagicMock()
-    model.embed = MagicMock(
-        side_effect=lambda texts: [[0.1] * _EMBEDDING_DIM for _ in texts]
-    )
-    return model
-
-
-@pytest.fixture
-def mock_chunker() -> MagicMock:
-    chunker = MagicMock()
-    chunker.chunk = MagicMock(return_value=["chunk one", "chunk two"])
-    return chunker
-
-
-@pytest.fixture
-def mock_code_chunker() -> MagicMock:
-    chunker = MagicMock()
-    chunker.chunk = MagicMock(return_value=["chunk one", "chunk two"])
-    return chunker
+# No fixtures needed for unit tests yet.
+# Unit tests cover pure functions and value objects with no dependencies.
+# External-boundary mocks (llm, embedding_model) live in tests/integration/conftest.py.