added check for null argument in NamedLikeFactoryMethod syntax extension method

Author: ursenzler

src/Ninject.Extensions.Factory.Test/FactoryTests.cs

@@ -101,6 +101,14 @@ public void NamedLikeFactoryMethodThrowsExceptionWhenNotAGetFactoryMethod()
             action.ShouldThrow<ArgumentException>();
         }
 
+        [Fact]
+        public void NamedLikeFactoryMethodThrowsExceptionWhenActionIsNull()
+        {
+            Action action = () => this.kernel.Bind<IWeapon>().To<Sword>().NamedLikeFactoryMethod<Sword, ICustomizableWeapon>(null);
+            
+            action.ShouldThrow<ArgumentNullException>();
+        }
+
         [Fact]
         public void GetFallback()
         {

src/Ninject.Extensions.Factory/BindToExtensions.cs

@@ -100,6 +100,11 @@ public static IBindingWhenInNamedWithOrOnSyntax<object> ToFactory(this IBindingT
         /// </returns>
         public static IBindingWithOrOnSyntax<TInterface> NamedLikeFactoryMethod<TInterface, TFactory>(this IBindingNamedSyntax<TInterface> syntax, Expression<Action<TFactory>> action)
         {
+            if (action == null)
+            {
+                throw new ArgumentNullException("action");
+            }
+
             var methodCallExpression = action.Body as MethodCallExpression;
 
             if (methodCallExpression == null)