What should I look for in a proofreading service?

What should I look for in a proofreading service? I want to be aware why we are using test class and service. My first question can be a clean-up question. Should I use another or should I use another class (instead of testing all method of that service)? I would like something like this: test class class Button { [Bindable] public string name { get { return “Button”; } set { self.name = value; } } } main class: public class Main { static void Main() { using (var reader = new FileReader) { var readerData = new DataTable(); var readerData2 = new DataTable(); var readerData3 = new DataTable(); var readerData4 = new DataTable(); readerData4.SelectedIndex = 3; var readerData = new Database.ReadFileRecord