public void load_state()
        {
            var state = _sut.Load();

            state.Should().NotBeNull();
            var configs = new[] { new EndpointMessagesConfig()
                                  {
                                      Endpoint = DomainBus.Configuration.EndpointId.TestValue
                                  } };

            state.Update(configs);
            _sut.Save(state);

            var load = _sut.Load();

            load.ShouldBeEquivalentTo(state);
            load.Items.Should().NotBeEmpty();
        }