Calling static methods from a WCF service

AllStaticAllTheTime.cs

// The WCF service class
public class Service1 : IService1
{
    public string GetData(int value)
    {
        return ServiceLogic.GetData(value);
    }
}

// Class with static methods and a static instance of DB/service instances
public class ServiceLogic
{
    private static Context context;

    internal static Context Context
    {
        get
        {
            if (context == null)
            {
                initializeContext();
            }

            return context;
        }
    }

    // Used for unit testing. Must be set back to null or previous value after test or before next test.
    internal static void InjectContext(Context context)
    {
        ServiceLogic.context = context;
    }

    static void initializeContext()
    {
        context = new Context();
    }

    public static string GetData(int value)
    {
        return Context.GetData(value);
    }
}

public class Context
{
    private DataLayer dataLayer;

    public Context()
    {
        this.dataLayer = new DataLayer();
    }

    public string GetData(int value)
    {
        return this.dataLayer.GetData(value);
    }
}

public class DataLayer
{
    public string GetData(int value)
    {
        return string.Format("You entered: {0}", value);
    }
}