🚚 Move backend tests outside the app directory (#1862)

Co-authored-by: Alejandra <90076947+alejsdev@users.noreply.github.com>

backend/tests/scripts/test_backend_pre_start.py

@@ -0,0 +1,33 @@
+from unittest.mock import MagicMock, patch
+
+from sqlmodel import select
+
+from app.backend_pre_start import init, logger
+
+
+def test_init_successful_connection() -> None:
+    engine_mock = MagicMock()
+
+    session_mock = MagicMock()
+    exec_mock = MagicMock(return_value=True)
+    session_mock.configure_mock(**{"exec.return_value": exec_mock})
+
+    with (
+        patch("sqlmodel.Session", return_value=session_mock),
+        patch.object(logger, "info"),
+        patch.object(logger, "error"),
+        patch.object(logger, "warn"),
+    ):
+        try:
+            init(engine_mock)
+            connection_successful = True
+        except Exception:
+            connection_successful = False
+
+        assert (
+            connection_successful
+        ), "The database connection should be successful and not raise an exception."
+
+        assert session_mock.exec.called_once_with(
+            select(1)
+        ), "The session should execute a select statement once."