public void IsValidEmployeeNumber_WhenStringIsNotValidEmployeeNumber_Throws(string value)
 {
     var data = new FileData { StringValue = value };
     Assert.Throws<ArgumentException>(() => data.IsValidEmployeeNumber());
 }
 public void IsValidEmployeeNumber_WhenStringIsValidEmployeeNumber_Succeeds(string value)
 {
     var data = new FileData { StringValue = value };
     Assert.DoesNotThrow(() => data.IsValidEmployeeNumber());
 }