public NullKeysSqliteFixture() { var serviceProvider = new ServiceCollection() .AddEntityFrameworkSqlite() .AddSingleton(TestModelSource.GetFactory(OnModelCreating)) .BuildServiceProvider(validateScopes: true); _options = new DbContextOptionsBuilder() .UseSqlite(SqliteTestStore.CreateConnectionString("StringsContext")) .UseInternalServiceProvider(serviceProvider) .Options; CreateContext().Database.EnsureClean(); EnsureCreated(); }