public void AtivarModoOffline_AlteraConfiguraçãoIsContingencia()
        {
            // Arrange

            var notaFiscalServiceMock = new Mock <IEnviaNotaFiscalService>();
            IEnviaNotaFiscalService       enviaNotaFiscalService       = notaFiscalServiceMock.Object;
            IConfiguracaoRepository       configuracaoRepository       = new ConfiguracaoRepositoryFake();
            IConsultaStatusServicoService consultaStatusServicoService = new Mock <IConsultaStatusServicoService>().Object;
            INotaFiscalRepository         notaFiscalRepository         = new Mock <INotaFiscalRepository>().Object;
            var notaFiscalContingenciaServiceMock = new Mock <IEmiteNotaFiscalContingenciaService>();
            IEmiteNotaFiscalContingenciaService emiteNotaFiscalContingenciaService = notaFiscalContingenciaServiceMock.Object;

            var modoOnlineService = new NotasFiscais.Services.ModoOnlineService(enviaNotaFiscalService, configuracaoRepository, consultaStatusServicoService, notaFiscalRepository, emiteNotaFiscalContingenciaService);

            // Act

            var configuracao = configuracaoRepository.GetConfiguracao();

            configuracao.IsContingencia = false;
            configuracaoRepository.Salvar(configuracao);
            Assert.False(configuracaoRepository.GetConfiguracao().IsContingencia);

            modoOnlineService.AtivarModoOffline("Teste unitário", DateTime.Now);

            configuracao = configuracaoRepository.GetConfiguracao();

            // Assert

            Assert.True(configuracao.IsContingencia);
        }