public void AlertWithoutSentIsInvalid()
        {
            var alert = new Alert();

            alert.Sent = null;

            var sentRequiredValidator = new SentRequiredValidator(alert);

            Assert.False(sentRequiredValidator.IsValid);
        }
        public void AlertWithSentIsValid()
        {
            var alert = new Alert();

            alert.Sent = new DateTimeOffset(2008, 5, 1, 8, 6, 32,
                                            new TimeSpan(1, 0, 0));

            var sentRequiredValidator = new SentRequiredValidator(alert);

            Assert.True(sentRequiredValidator.IsValid);
        }