title: How to write an integration test in NUnit?
body: <p>We are two students writing our bachelor thesis and we have developed a Windows Application, which should be able to aid a restaurant in various communication processes. Fundamentally, it should be able to present information about the order from the moment a guest send it to it is served. </p>
  
  <p>We have omitted to test during the development but have decided to write unit tests now. Nevertheless, we have found out that the most suitable test we can write to our system now are integration tests because all the methods in our classes are bound to SQL stored procedures via LINQ to SQL. We are aware of the usage of stubs to fake out a dependency to a database, but when our database already is implemented together with all the functions, we figured it would give us more value to test several methods together as an integration test.</p>
  
  <p>As seen in the code below we have tried to follow the guide lines for a unit test, but is this the right way to write an integration test?</p>
  
  <pre><code>[Test]
  public void SendTotalOrder_SendAllItemsToProducer_OneSentOrder()
  {
      //Arrange
      Order order = new Order();
      Guest guest = new Guest(1, order);
      Producer producer = new Producer("Thomas", "Guldborg", "Beverage producer");            
      DataGridView dataGridView = new DataGridView { BindingContext = new BindingContext() };
      order.MenuItemId = 1;
      order.Quantity = 1;
  
      //Act
      guest.AddItem();
      dataGridView.DataSource = guest.SendOrderOverview();
      guest.SendOrder(dataGridView);
      dataGridView.DataSource = producer.OrderOverview();
      var guestTableOrder = producer.OrderOverview()
          .Where(orders =&gt; orders.gtid == guest.GuestTableId)
          .Select(producerOrder =&gt; producerOrder.gtid) 
          .Single();
  
      //Assert
      Assert.That(guestTableOrder, Is.EqualTo(guest.GuestTableId));
  }
  </code></pre>