Retail giant Walmart is testing out grocery delivery through its Walmart and Sam’s Club retail stores.

The company is working with Uber in Phoenix and Lyft in Denver to begin testing grocery delivery services starting in the next two weeks.

These test runs coincide through another test project Walmart started in March with Deliv, a same-day delivery service. This test project involves delivery of general merchandise and groceries for business members in Miami.

“We’re thrilled about the possibility of delivering new convenient options to our customers, and about working with some transformative companies in this test,” said Michael Bender, EVP and Chief Operating Officer, Walmart Global eCommerce, in a press release.

Customers place their grocery orders online, and specially trained Walmart employees pull the items from shelves and bag them. They put the grocery order into an Uber or Lyft vehicle for delivery to the customer.

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“It’s all seamless to the customer,” Bender said. “They pay us our normal $7-10 delivery charge online, and make no payment to the driver. We’ll also let them know their order is being delivered by a driver from Uber or Lyft.”

Walmart wants to take a leading role in the growing segment. Online grocery shopping and delivery has been estimated to be worth $10.9 billion in the U.S. Autonomous vehicles may play a role in delivery services in the future, with General Motors and Lyft poised to test out a wide range of services in self-driving Chevy Bolts.

The Detroit Bureau