public BuiltInDataTypesInMemoryFixture()
        {
            _testStore = new InMemoryTestStore();
            _serviceProvider = new ServiceCollection()
                .AddEntityFramework()
                .AddInMemoryDatabase()
                .ServiceCollection()
                .AddSingleton(TestInMemoryModelSource.GetFactory(OnModelCreating))
                .BuildServiceProvider();

            var optionsBuilder = new DbContextOptionsBuilder();
            optionsBuilder.UseInMemoryDatabase();
            _options = optionsBuilder.Options;
        }