ConfgFormsForTestMethods.cs

// 1 Way
public class Configuration
{
    public string EndPoint
    {
        get { return ConfigurationManager.AppSettings["EndPoint"]; }
    }

    // other properties here//
}

// 2 WAy
public interface IConfiguration
{
    string EndPoint { get; }
}

public class Configuration
    : IConfiguration
{
    public string EndPoint
    {
        get { return ConfigurationManager.AppSettings["EndPoint"]; }
    }

    // other properties here//
}

// 3 Way
public class Configuration
{
    public string EndPoint { get; set; }
    // other properties here//
}

public class ConfigurationLoader
{
    public Configuration Load()
    {
        return new Configuration
        {
            EndPoint = ConfigurationManager.AppSettings["EndPoint"]
            // other properties here//
        };
    }
}