private static void RegisterConfigurationCache(IServiceCollection services, PlainConfiguration plainConfiguration)
        {
            var plainConfigurationCache = new PlainConfigurationCache();

            plainConfigurationCache.Add(plainConfiguration);

            services.AddSingleton <IPlainConfigurationCache>(plainConfigurationCache);
        }
 public void SetUp()
 {
     this.sut = new PlainConfigurationCache();
 }