test: increased cb test coverage

test/unit/test_main.py

@@ -0,0 +1,75 @@
+import asyncio
+import sys
+from unittest.mock import AsyncMock, patch
+
+import pytest
+from fastapi.testclient import TestClient
+
+from control_backend.api.v1.router import api_router
+from control_backend.main import app, lifespan
+
+# Fix event loop on Windows
+if sys.platform == "win32":
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
+
+@pytest.fixture
+def client():
+    # Patch setup_logging so it does nothing
+    with patch("control_backend.main.setup_logging"):
+        with TestClient(app) as c:
+            yield c
+
+
+def test_root_fast():
+    # Patch heavy startup code so it doesn’t slow down
+    with patch("control_backend.main.setup_logging"), patch("control_backend.main.lifespan"):
+        client = TestClient(app)
+        resp = client.get("/")
+        assert resp.status_code == 200
+        assert resp.json() == {"status": "ok"}
+
+
+def test_cors_middleware_added():
+    """Test that CORSMiddleware is correctly added to the app."""
+    from starlette.middleware.cors import CORSMiddleware
+
+    middleware_classes = [m.cls for m in app.user_middleware]
+    assert CORSMiddleware in middleware_classes
+
+
+def test_api_router_included():
+    """Test that the API router is included in the FastAPI app."""
+
+    route_paths = [r.path for r in app.routes]
+    for route in api_router.routes:
+        assert route.path in route_paths
+
+
+@pytest.mark.asyncio
+async def test_lifespan_agent_start_exception():
+    """
+    Trigger an exception during agent startup to cover the error logging branch.
+    Ensures exceptions are logged properly and re-raised.
+    """
+    with (
+        patch("control_backend.main.VADAgent.start", new_callable=AsyncMock),
+        patch("control_backend.main.VADAgent.reset_stream", new_callable=AsyncMock),
+        patch(
+            "control_backend.main.RICommunicationAgent.start", new_callable=AsyncMock
+        ) as ri_start,
+        patch("control_backend.main.setup_logging"),
+        patch("control_backend.main.threading.Thread"),
+    ):
+        # Force RICommunicationAgent.start to raise an exception
+        ri_start.side_effect = Exception("Test exception")
+
+        with patch("control_backend.main.logger") as mock_logger:
+            with pytest.raises(Exception, match="Test exception"):
+                async with lifespan(app):
+                    pass
+
+            # Verify the error was logged correctly
+            assert mock_logger.error.called
+            args, _ = mock_logger.error.call_args
+            assert isinstance(args[2], Exception)