protected override void Arrange()
        {
            base.Arrange();

            ConfigurationSourceModel sourceModel = Container.Resolve <ConfigurationSourceModel>();

            sourceModel.AddSection(ConfigurationSourceSection.SectionName, new ConfigurationSourceSection()
            {
                SelectedSource = "file source",
                Sources        = { { new FileConfigurationSourceElement("file source", ".\\config") } }
            });

            exportMergedEnvironmentCommand = base.EnvironmentViewModel.Commands.OfType <SaveMergedEnvironmentConfigurationCommand>().First();

            base.UIServiceMock.Setup(x => x.ShowMessageWpf(It.IsRegex("File Configuration Source"), It.IsAny <string>(), MessageBoxButton.OK))
            .Returns(MessageBoxResult.OK)
            .Verifiable();
        }
        protected override void Act()
        {
            SaveMergedEnvironmentConfigurationCommand saveEnvrionmentConfig = base.EnvironmentViewModel.Commands.OfType <SaveMergedEnvironmentConfigurationCommand>().First();

            saveEnvrionmentConfig.Execute(null);
        }