How to unit test attributes with MsTest using C#?

Question

How to test the presence of Class Attributes and Method Attributes with MsTest using C#?

Answer 1

C# Extension method for checking attributes

public static bool HasAttribute<TAttribute>(this MemberInfo member) 
    where TAttribute : Attribute
{
    var attributes = 
        member.GetCustomAttributes(typeof(TAttribute), true);

    return attributes.Length > 0;
}