public void FindPluginFamilies()
        {
            var graph = new PluginGraph();

            graph.Scan(x => { x.Assembly("StructureMap.Testing.Widget"); });

            graph.FindFamily(typeof(IWidget)).DefaultInstanceKey = "Blue";
            graph.CreateFamily(typeof(WidgetMaker));

            graph.Seal();


            foreach (PluginFamily family in graph.PluginFamilies)
            {
                Console.WriteLine(family.PluginType.AssemblyQualifiedName);
            }

            Assert.AreEqual(5, graph.FamilyCount);
        }