public void ToCieloFormatDate_Given20111221_ShouldReturnInCieloFormat()
 {
     var transactionDate = new DateTime(1988, 05, 15, 23, 01, 08);
     transactionDate.ToCieloFormatDate().Should().Be("1988-05-15T23:01:08");
 }
 public void ToCieloFormatDate_GivenADate_ShouldReturnInCieloFormat()
 {
     var transactionDate = new DateTime(2011, 12, 21, 11, 32, 45);
     transactionDate.ToCieloFormatDate().Should().Be("2011-12-21T11:32:45");
 }