public void ItShouldDeleteExistingPlan()
        {
            var dataService = new Mock <IForecastDataAccessService>();

            dataService.Setup(x => x.DeletePlan(It.IsAny <int>())).Returns(true);

            var service = new ForecastService <int>(dataService.Object);

            Assert.IsTrue(service.DeletePlan(1));
        }