public void IsValidStringId_GivenIdStringt(string idString, bool resultBool)
        {
            var validation = new BookInputValidationService();
            var result     = validation.IsValidStringId(idString);

            result.Should().Be(resultBool);
        }
        public void IsValidLanguage()
        {
            var dataString = new Dictionary <string, string>()
            {
                { "Language", "Test" }
            };
            var validation = new BookInputValidationService();

            Xunit.Assert.Throws <Exception>(() => validation.IsValidLanguage(dataString));
        }