public void ShouldNotThrowFormatExceptionWhenDateIsValid(string aTime)
        {
            //GIVEN
            var aTimeValidator = new ATimeValidator();

            //THEN
            Assert.DoesNotThrow(() => aTimeValidator.Validate(aTime));
        }
        public void ShouldThrowFormatExceptionWhenDateIsInvalid(string aTime)
        {
            //GIVEN
            var aTimeValidator = new ATimeValidator();

            //THEN
            Assert.Throws <FormatException>(() => aTimeValidator.Validate(aTime));
        }