Added get description of missing dependencies

Helper method to use in most common scenarios

Author: kkozmic

ConventionTests/ConventionTests.NUnit.cs

@@ -6,8 +6,10 @@
 using ApprovalTests.Core;
 using ApprovalTests.Namers;
 using Castle.MicroKernel;
+using Castle.MicroKernel.Handlers;
 using Castle.Windsor;
 using Castle.Windsor.Diagnostics;
+using Castle.Windsor.Diagnostics.DebuggerViews;
 using Castle.Windsor.Diagnostics.Helpers;
 using NUnit.Framework;
 using Approvals = ApprovalTests.Approvals;
@@ -178,6 +180,12 @@ public override void Execute()
 			}
 		}
 
+		protected string MissingDependenciesDescription(IHandler var)
+		{
+			var item = new ComponentStatusDebuggerViewItem((IExposeDependencyInfo) var);
+			return item.Message;
+		}
+
 		private TDiagnosticData[] GetDataToTest(WindsorConventionData<TDiagnosticData> data)
 		{
 			var host = data.Kernel.GetSubSystem(SubSystemConstants.DiagnosticsKey) as IDiagnosticsHost;