def METHOD_NAME(self, vector_system):
    builder = DiagramBuilder()
    system = builder.AddSystem(vector_system)
    logger = builder.AddSystem(VectorLogSink(vector_system.output_size))
    builder.Connect(system.get_output_port(0), logger.get_input_port(0))
    diagram = builder.Build()
    context = diagram.CreateDefaultContext()
    simulator = Simulator(diagram, context)
    # Get the log and make sure its original values are as expected.
    log = logger.FindLog(context)
    return simulator, log, context