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;
}