Include ninject activation errors in test faulure messages

Author: kevinkuszyk

src/FluentAssertions.Ioc.Ninject/CollectionOfTypesKernelAssertions.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using System.Text;
 using FluentAssertions.Execution;
+using FluentAssertions.Formatting;
 using FluentAssertions.Ioc.Ninject.Internal;
 using Ninject;
 
@@ -66,14 +67,26 @@ public void WithAtLeastOneInstance()
                              .FailWith(BuildFailureMessage(failed));
         }
 
-        private string BuildFailureMessage(List<ActivationError> failed)
+        private string BuildFailureMessage(IEnumerable<ActivationError> failed)
         {
             // Build the failure message
             var builder = new StringBuilder();
+            var exceptionBuilder = new StringBuilder();
             builder.AppendLine("The following types could not be resolved:").AppendLine();
-            
+
             foreach (var error in failed)
+            {
                 builder.AppendFormat(" - {0}", error.Type.FullName).AppendLine();
+
+                if (error.Exception != null)
+                {
+                    exceptionBuilder.AppendLine(Formatter.ToString(error.Exception));
+                    exceptionBuilder.AppendLine();
+                }
+            }
+
+            builder.AppendLine();
+            builder.AppendLine(exceptionBuilder.ToString());
 
             return builder.ToString();
         }

src/FluentAssertions.Ioc.Ninject/SingleTypeKernelAssertions.cs

@@ -1,5 +1,7 @@
 using System;
+using System.Text;
 using FluentAssertions.Execution;
+using FluentAssertions.Formatting;
 using FluentAssertions.Ioc.Ninject.Internal;
 using Ninject;
 
@@ -55,7 +57,18 @@ public void To<T>()
 
         private string BuildFailureMessage(ActivationError error)
         {
-            return String.Format("Unable to resolve type {0}", error.Type.FullName);
+            var builder = new StringBuilder();
+
+            builder.AppendFormat("Unable to resolve type {0}.", error.Type.FullName);
+
+            if (error.Exception != null)
+            {
+                builder.AppendLine();
+                builder.AppendLine();
+                builder.Append(Formatter.ToString(error.Exception));    
+            }
+            
+            return builder.ToString();
         }
     }
 }