Merge branch 'master' of https://github.com/Wind010/commandline into develop

Author: ericnewton76

src/CommandLine/Core/ReflectionExtensions.cs

@@ -14,6 +14,8 @@ namespace CommandLine.Core
 {
     static class ReflectionExtensions
     {
+        public const string CannotSetValueToTargetInstance = "Cannot set value to target instance.";
+
         public static IEnumerable<T> GetSpecifications<T>(this Type type, Func<PropertyInfo, T> selector)
         {
             return from pi in type.FlattenHierarchy().SelectMany(x => x.GetTypeInfo().GetProperties())
@@ -91,6 +93,10 @@ public static IEnumerable<Error> SetProperties<T>(
 
         private static IEnumerable<Error> SetValue<T>(this SpecificationProperty specProp, T instance, object value)
         {
+            Action<Exception> fail = inner => {
+                throw new InvalidOperationException(CannotSetValueToTargetInstance, inner);
+            };
+            
             try
             {
                 specProp.Property.SetValue(instance, value, null);
@@ -104,6 +110,13 @@ private static IEnumerable<Error> SetValue<T>(this SpecificationProperty specPro
             {
                  return new[] { new SetValueExceptionError(specProp.Specification.FromSpecification(), e, value) };
             }
+            catch(ArgumentException e)
+            {
+                var argEx = new ArgumentException(InvalidAttributeConfigurationError.ErrorMessage, e);
+                fail(argEx);
+            }
+
+            return instance;
         }
 
         public static object CreateEmptyArray(this Type type)

src/CommandLine/Error.cs

@@ -65,6 +65,11 @@ public enum ErrorType
         /// Value of <see cref="CommandLine.SetValueExceptionError"/> type.
         /// </summary>
         SetValueExceptionError
+        VersionRequestedError,
+        /// <summary>
+        /// Value of <see cref="CommandLine.InvalidAttributeConfigurationError"/> type.
+        /// </summary>
+        InvalidAttributeConfigurationError
     }
 
     /// <summary>

tests/CommandLine.Tests/Fakes/Options_With_InvalidDefaults.cs

@@ -0,0 +1,11 @@
+
+namespace CommandLine.Tests.Fakes
+{
+    class Options_With_InvalidDefaults
+    {
+        // Default of string and integer type property will also throw.
+
+        [Option(Default = false)]
+        public string FileName { get; set; }
+    }
+}

tests/CommandLine.Tests/Unit/Core/InstanceBuilderTests.cs

@@ -1133,7 +1133,22 @@ public void Parse_TimeSpan()
             // Teardown
         }
 
-        public static IEnumerable<object[]> RequiredValueStringData
+        [Fact]
+        public void Build_DefaultBoolTypeString_ThrowsInvalidOperationException()
+        {
+            // Exercize system 
+            Action test = () => InvokeBuild<Options_With_InvalidDefaults>(
+                new string[] { });
+
+            // Verify outcome
+            test.ShouldThrow<InvalidOperationException>()
+                .WithMessage(ReflectionExtensions.CannotSetValueToTargetInstance)
+                .WithInnerException<ArgumentException>()
+                .WithInnerMessage(InvalidAttributeConfigurationError.ErrorMessage);
+        }
+
+
+        public static IEnumerable<object> RequiredValueStringData
         {
             get
             {