public void GetMonthlySalesAndPurches_NullDealerId_ShouldEqualToIdOne()
{
int?dealersIdNull = null;
var monthlyOne = sut.GetMonthlyPurchaseAndSalePrice(1).Result.GetObject <IEnumerable <DatePurchaseAndSalePriceModel> >();
var monthlyNull = sut.GetMonthlyPurchaseAndSalePrice(dealersIdNull).Result.GetObject <IEnumerable <DatePurchaseAndSalePriceModel> >();
foreach (var item in monthlyOne)
{
var monthNull = monthlyNull.Single(i => i.Date.Date == item.Date.Date);
Assert.AreEqual(item.PurchasesAmount, monthNull.PurchasesAmount);
Assert.AreEqual(item.SalesAmount, monthNull.SalesAmount);
}
}