The U.S. government did final tests of the Obamacare website just days before it went public, while similar projects are tested for months, the main contractors told a House panel investigating flaws that hobbled the debut. Units of CGI Group Inc. (GIB/A) and UnitedHealth Group Inc. (UNH), which designed healthcare.gov, said a branch of the U.S. Department of Health and Human Services was responsible for the end-to-end testing that they said should have been done months earlier. "It would have been better to have more time," Cheryl Campbell, a senior vice president at CGI Federal Inc., the site designer, told the House Energy and Commerce Committee.