public void CheckExistAuthorReallyExists()
        {
            //Arrange
            repository.Create(new AuthorEM()
            {
                FirstName = "Max", LastName = "Smith", YearBorn = 1900
            });
            repository.Create(new AuthorEM()
            {
                FirstName = "Kelly", LastName = "Somers", YearBorn = 1950
            });

            //Act
            bool resultAuthor1FirstLetter = service.CheckExist(new AuthorVM()
            {
                FirstName = "Max", LastName = "Smith", Born = 1900
            });
            bool resultAuthor1LowerCase = service.CheckExist(new AuthorVM()
            {
                FirstName = "max", LastName = "smith", Born = 1900
            });
            bool resultAuthor1UpperCase = service.CheckExist(new AuthorVM()
            {
                FirstName = "MAX", LastName = "SMITH", Born = 1900
            });
            bool resultAuthor1MixedCase = service.CheckExist(new AuthorVM()
            {
                FirstName = "MaX", LastName = "SmItH", Born = 1900
            });



            //Assert
            Assert.IsTrue(resultAuthor1FirstLetter);
            Assert.IsTrue(resultAuthor1LowerCase);
            Assert.IsTrue(resultAuthor1UpperCase);
            Assert.IsTrue(resultAuthor1MixedCase);
        }