NEW YORK (Reuters) -Donald Trump and two of his adult children, Donald Trump Jr. and Ivanka Trump, have agreed to testify starting July 15 in a New York state civil investigation into the former U.S. president’s business practices. The Trumps’ testimony could last through the following week, according to an agreement with state Attorney General Letitia James made public on Wednesday. James is investigating whether the Trump Organization misled lenders and tax authorities. The deal for the Trumps to testify came more than six months after James first issued subpoenas for their testimony, which …