public void TestContainsObject()
{
Product toaster = new Product {Name = "toaster"};
Shop shop = new Shop {Products = {toaster}};
ObjectGraph graph = new ObjectGraph(shop);
Assert.IsTrue(graph.ContainsNode(toaster));
}
public void TestDoesNotContainObject()
{
Product kettle = new Product { Name = "kettle" };
Product toaster = new Product { Name = "toaster" };
Shop shop = new Shop {Products = {kettle}};
ObjectGraph graph = new ObjectGraph(shop);
Assert.IsFalse(graph.ContainsNode(toaster));
}