public void MustdReturnIdOfMostExpensiveSale()
        {
            var sales = SaleDataProvider.GenerateTwoSales();
            var mostExpensiveSales = _service.CalculateMostExpensiveSales(sales);

            Assert.AreEqual(1, mostExpensiveSales.Count);
            Assert.AreEqual("01", mostExpensiveSales.First());
        }
        public void MustReturnNameOfWorstSeller()
        {
            var sales        = SaleDataProvider.GenerateTwoSales();
            var worstSellers = _service.CalculateWorstSellers(sales);

            Assert.AreEqual(1, worstSellers.Count);
            Assert.AreEqual("João", worstSellers.First());
        }