test: bootstrap pytest environment for backend

surfsense_backend/tests/unit/conftest.py

@@ -0,0 +1,49 @@
+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