public void ItShouldDeleteResults()
{
var plan = new ForecastPlan <int> {
CreationDate = DateTime.Today, Id = 1
};
var dataService = new Mock <IForecastDataAccessService>();
dataService.Setup(x => x.DeleteResults(It.IsAny <int>())).Verifiable();
dataService.Setup(x => x.GetPlan(1)).Returns(plan);
var service = new ForecastService <int>(dataService.Object);
service.LoadPlan(1);
service.DeleteResults();
dataService.Verify(x => x.DeleteResults(1), Times.Once());
}