Tollerate null references in Argument Expression

Author: Jake Ginnivan

TestStack.BDDfy.Tests/Scanner/FluentScanner/ExpressionExtensionsTests.cs

@@ -218,6 +218,14 @@ public void ComplexArgument2()
             AssertReturnedArguments(arguments, container.SubContainer);
         }
 
+        [Test]
+        public void ComplexArgumentWhenContainerIsNull()
+        {
+            ContainerType nullContainer = null;
+            var arguments = GetArguments(x => x.MethodWithInputs(nullContainer.SubContainer), new ClassUnderTest());
+            AssertReturnedArguments(arguments, new object[] { null });
+        }
+
         [Test]
         public void ArrayInputArgumentsProvidedUsingInheritedProperty()
         {

TestStack.BDDfy/Scanners/StepScanners/Fluent/ExpressionExtensions.cs

@@ -223,10 +223,17 @@ private static IEnumerable<object> ExtractPropertyValue<T>(MemberExpression expr
             if (memberExpression != null)
             {
                 var extractArguments = ExtractArguments(memberExpression, value);
-                return new[]
+                try
+                {
+                    return new[]
                        {
                            member.GetValue(extractArguments.Single(), null)
                        };
+                }
+                catch (TargetException)
+                {
+                    return new object[] {null};
+                }
             }
             return new[]
                        {