public static void TestItems() { ProgressContext progress = new ProgressContext(); Assert.That(progress.Items, Is.EqualTo(0), "At start there are no item counted."); progress.AddItems(7); Assert.That(progress.Items, Is.EqualTo(7), "There was just 7 added."); progress.AddItems(-1); Assert.That(progress.Items, Is.EqualTo(6), "Items are counted down by adding negative numbers."); }