Function initialize

__tests__/fts5-fallback.test.ts:58–62

(filename = 'test.db')

  });

  function initialize(filename = 'test.db'): DatabaseConnection {
    const connection = DatabaseConnection.initialize(path.join(dir, filename));
    connections.push(connection);
    return connection;
  }

  function reopen(connection: DatabaseConnection): DatabaseConnection {
    connection.close();