public function testSortStrategy()
{
$h3 = new Holiday('Test3', new DateTime('2016-03-02'), new DateTime('2016-03-02'));
$h1 = new Holiday('Test1', new DateTime('2016-01-02'), new DateTime('2016-01-02'));
$h2 = new Holiday('Test2', new DateTime('2016-02-02'), new DateTime('2016-02-02'));
$h4 = new Holiday('Test4', new DateTime('2016-03-02'), new DateTime('2016-04-02'));
$holidays = array($h3, $h1, $h2);
usort($holidays, array(get_class($h1), 'sortStrategy'));
$this->assertEquals($h1, $holidays[0]);
$this->assertEquals($h2, $holidays[1]);
$this->assertEquals($h3, $holidays[2]);
$this->assertEquals(0, Holiday::sortStrategy($h3, $h4));
}
