test for logging MSBuild items items

LogTaskItems.cs

        private void LogProperty(PropertyInfo propertyInfo)
        {
            string name = propertyInfo.Name;
            var value = propertyInfo.GetValue(this);
            if (value is ITaskItem[])
            {
                LogTaskItems(value as ITaskItem[], name);
            }
            else
            {
                Log.LogMessage(MessageImportance.High, "  {0} = {1}", name, value);
            }
        }

        private void LogTaskItems(ITaskItem[] taskItems, string itemGroup)
        {
            Log.LogMessage(MessageImportance.High, "  {0} =", itemGroup);

            foreach (var item in taskItems)
            {
                LogTaskItem(item);
            }
        }

        private void LogTaskItem(ITaskItem item)
        {
            Log.LogMessage(MessageImportance.High, "    {0}", item.ItemSpec);
        }

TaskItemsGetLogged.cs

        [TestMethod]
        public void TaskItemsGetLogged()
        {
            var buildTarget = CreateBuildTarget();
            var itemGroup = buildTarget.AddItemGroup();
            itemGroup.AddItem("Foo", "a");
            itemGroup.AddItem("Foo", "b");
            buildTarget.AddTask<TaskWithItems>().SetParameter("Foo", "@(Foo)");

            const string expected = @"Inputs:
  Foo =
    a
    b
";
            AssertTargetOutput(expected, buildTarget);
        }