AdapterPattern.cs

public interface ICheckRequests
{
    bool IsLocal();
}

public class ProductionRequestChecker : ICheckRequests
{
    public bool IsLocal() 
    {
        return HttpContext.Current.Request.IsLocal;
    }
}
// this goes in your tests assembly. or you can use moq
public class NotLocalFakeRequestChecker : ICheckRequests
{
    public bool IsLocal() 
    {
        return false;
    }
}