public void Index_returns_a_list_of_the_existing_appointments()
{
var repository = new InMemoryAppointmentRepository();
repository.Create(MakeAppointment(1, "John"));
repository.Create(MakeAppointment(2, "Jane"));
var controller = GetAppointmentsController(repository);
var result = controller.Index() as ViewResult;
Assert.That(result.ViewData.Model, Is.EqualTo(repository.FindAll()));
}