Wal-Mart has begun testing an online grocery delivery service, called Wal-Mart to Go, in the San Jose, Calif., area.

The company has been expanding its online options, including a nationwide rollout of a service that lets customers order merchandise (not food) online and pick it up in the store the same day. While that program is aimed at getting shoppers into stores more frequently, this one creates a more convenient way to buy from Wal-Mart.

Wal-Mart declined to make executives available for interviews about the grocery test, which started Saturday. In early March, asked about the possibility of an online grocery ordering service, Steve Nave, senior vice president and general manager of Walmart.com, would not discuss specifics.

“One of the great things about Wal-Mart is we’ll put something out there, test and learn from it,” he said. “I would say nothing is off limits.”