MAESTRO: scaffold backend fastapi app

backend/tests/__init__.py

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+"""Backend tests package."""

backend/tests/test_main.py

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+from fastapi.testclient import TestClient
+
+from app.main import app
+
+
+client = TestClient(app)
+
+
+def test_root_returns_ok() -> None:
+    response = client.get("/")
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok"}