Martha Stewart testifies at the New York State Supreme Court on Tuesday in New York City. Stewart, 71, is at the center of a bitter legal battle between two of the nation's largest retailers, Macy's Inc. and J.C. Penney Co. Macy's sued the media and merchandising company Stewart founded for breaching an exclusive contract when she signed a deal with Penney in December 2011 to open shops at most of its stores this spring. Macy's, which has sold Martha Stewart products including towels and pots since 2007, is trying to block Penney from selling those products.