Fix test case

Author: christopher-wild

tests/json_front_tests/test_json_class.py

@@ -256,9 +256,9 @@ def test_no_data_provided(self):
         }
         json_class = JsonUtility("temp_out.txt", True)
         json_class.set_paths(self.json_path, self.dag_path)
-        json_class.setup(self.scenario)
 
-        self.assertRaises(ValueError)
+        with self.assertRaises(ValueError):
+            json_class.setup(self.scenario)
 
     def tearDown(self) -> None:
         remove_temp_dir_if_existent()