public MappingQuerySqliteFixture()
        {
            var serviceProvider = new ServiceCollection()
                                  .AddEntityFrameworkSqlite()
                                  .AddSingleton <ILoggerFactory>(TestSqlLoggerFactory)
                                  .BuildServiceProvider(validateScopes: true);

            _testDatabase = SqliteTestStore.GetNorthwindStore();

            _options = new DbContextOptionsBuilder()
                       .UseModel(CreateModel())
                       .UseSqlite(
                _testDatabase.ConnectionString,
                b => b.SuppressForeignKeyEnforcement())
                       .UseInternalServiceProvider(serviceProvider)
                       .Options;
        }