public function testOneWeekHolidays()
 {
     $holiday = new Holiday();
     $holiday->setBeginAt(new \DateTime());
     $holiday->setEndAt(new \DateTime('+ 7 days'));
     $loader = new StaticHolidayLoader(array($holiday));
     $planning = new Planning($loader);
     $formatter = $planning->getDateFormatter();
     $nextTime = $planning->getFirstAvailableTime();
     $expected = new \DateTime('+8 days');
     $this->assertContains($formatter->format($expected), $nextTime);
 }