public void FormatDateTest()
{
var validTestDate = "12 07 2021";
var resultValid = CustomDateTime.FormatDate(validTestDate);
var expectedValid = "12-07-2021";
Assert.AreEqual(resultValid, expectedValid);
var notValidTestDate = "12sas07sx2021";
var resultNotValid = "";
bool threwException = false;
try{ resultNotValid = CustomDateTime.FormatDate(notValidTestDate); }
catch { threwException = true; }
Assert.IsTrue(threwException);
}