public function testGetHour()
{
$calendar = new Calendar();
$hour = $calendar->getHour(new \DateTime('2012-01-01 17:00'));
$this->assertInstanceOf('CalendR\\Period\\Hour', $hour);
$hour = $calendar->getHour(2012, 1, 1, 17);
$this->assertInstanceOf('CalendR\\Period\\Hour', $hour);
}