test: increased cb test coverage

test/unit/api/v1/endpoints/test_sse_endpoint.py

@@ -0,0 +1,24 @@
+import pytest
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+
+from control_backend.api.v1.endpoints import sse
+
+
+@pytest.fixture
+def app():
+    app = FastAPI()
+    app.include_router(sse.router)
+    return app
+
+
+@pytest.fixture
+def client(app):
+    return TestClient(app)
+
+
+def test_sse_route_exists(client):
+    """Minimal smoke test to ensure /sse route exists and responds."""
+    response = client.get("/sse")
+    # Since implementation is not done, we only assert it doesn't crash
+    assert response.status_code == 200