public void IsValidReturnFalseIfGivenDateIsNull()
        {
            var instance = new ValidateCurrentDateAttribute();

            bool result = instance.IsValid(null);

            Assert.False(result);
        }
        public void IsValidReturnTrueIfGivenDateIsInFuture()
        {
            var instance = new ValidateCurrentDateAttribute();

            bool result = instance.IsValid(DateTime.UtcNow.AddDays(1));

            Assert.True(result);
        }
        public void IsValidReturnFalseIfGivenDateIsInPast()
        {
            var instance = new ValidateCurrentDateAttribute();

            bool result = instance.IsValid(DateTime.UtcNow);

            Assert.False(result);
        }