The front of Lancaster’s Walmart has become a construction zone, as the company gears up to test the idea of far more self-checkout lanes and far fewer that use cashiers. Red tape occupies the area where multiple checkout lines used to be at the front of the store, and new banks of self-checkout stations are being installed at both of the front exits. “It’s a select group of stores that are testing out what works best for the customer,” said Walmart corporate spokesman Ragan Dickens.