public void ItShouldThrowExceptionWhenCreatingAnExistingPlan()
{
var dataService = new Mock <IForecastDataAccessService>();
dataService.Setup(x => x.PlanExist("Plan")).Returns(true);
var service = new ForecastService <decimal>(dataService.Object);
Assert.Throws(typeof(ForecastServiceException), () => service.CreatePlan("Plan", "Plan", 1, "userName", 1, 12));
}