MvcActionFilterTestHelper.cs

/// <summary>
/// Verifies the controller action, contains an attribute of the specified attributeType.
/// </summary>
/// <param name="controller">The controller.</param>
/// <param name="action">The action method.</param>
/// <param name="attributeType">Type of the attribute to look for.</param>
/// <returns>Returns true if the attribute was present on the action. Otherwise false.</returns>
public static bool VerifyControllerActionAttribute(this Controller controller, Func<ActionResult> action, Type attributeType)
{
	MethodInfo methodInfo = action.Method;
	object[] attributes = methodInfo.GetCustomAttributes(attributeType, true);

	return attributes.Any(a => a.GetType() == attributeType);
}

        public static bool VerifyActionAttribute<TAttribute, T>(Expression<Func<T>> expression)
        {
            var methodCallExp = (expression.Body as MethodCallExpression);

            if (methodCallExp != null)
            {
                var action = methodCallExp.Method;
                
                var attributes = action.GetCustomAttributes(typeof (TAttribute),false);

                return attributes.Length > 0;
            }

            return false;
        }