public void FindAvailableAppointments_returns_the_available_appointments() { var repository = new InMemoryAppointmentRepository(); var appointment = new Appointment(); repository.Create(appointment); var mockTimeConverter = new Mock<ITimeConverter>(); // For test purposes lets assume the local timezone is Pacific Standard Time. mockTimeConverter.Setup(x => x.ToLocalTime(It.IsAny<DateTime>(), It.IsAny<String>())) .Returns(new DateTime(2015, 07, 15, 12, 00, 00)); var appointmentsFinder = new AppointmentsFinder(repository, mockTimeConverter.Object); var currentTime = new DateTime(2015, 7, 15, 11, 30, 00); var availableAppointments = appointmentsFinder.FindAvailableAppointments(currentTime); CollectionAssert.Contains(availableAppointments, appointment); }