public void OrderedSuccessfully()
    {
        // Arrange.
        IPaymentValidator paymentValidatorMock = GetValidatorMock();
        IServerConnector  connectorMock        = GetConnectorMock();
        var pizzaOrderer = new PizzaOrderer(paymentValidatorMock, connectorMock);

        // Act.
        pizzaOrderer.MakeOrder(PIZZA_NAME);

        // Assert.
        connectorMock.Received(1).SendRequestForPizza(Arg.Any <string>());
    }