public void ShouldBeCorrectFormat()
        {
            var fileLine = new FileLine
            {
                CustomerCount = 10,
                SalesmanCount = 10,
                MostExpensive = 1000,
                WorseSalesman = "Teste"
            };

            var result = fileLine.ToString("{CustomerCount}ç{SalesmanCount}ç{MostExpensive}ç{WorseSalesman}");

            result.Contains(fileLine.WorseSalesman).Should().BeTrue();
            result.Contains(fileLine.CustomerCount.ToString()).Should().BeTrue();
            result.Contains(fileLine.SalesmanCount.ToString()).Should().BeTrue();
            result.Contains(fileLine.MostExpensive.ToString()).Should().BeTrue();
        }