McDonald's Tests Big Mac in a Tortilla Fast-Food Giant Rolls Out Snack Wrap Mac in Markets Including Houston, Wisconsin By Emily Bryson York Published: March 23, 2009 CHICAGO (AdAge.com) -- McDonald's might have to come up with a new "two all-beef patties" jingle for its newest product. The chain is testing the Snack Wrap Mac, which puts a new spin on the old classic: half a beef patty, special sauce, lettuce, cheese, pickles, onions -- wrapped in a flour tortilla. McDonald's spokeswoman Danya Proud said the $1.49 wrap is being sold in an "advertised test" in several U.S. markets, including...