public function testByDayYearly()
{
$rule = new Rule('FREQ=YEARLY;COUNT=3;BYDAY=20MO', new \DateTime('1997-05-19 16:00:00'));
$computed = $this->transformer->transform($rule);
$this->assertEquals(3, count($computed));
$this->assertEquals(new \DateTime('1997-05-19 16:00:00'), $computed[0]->getStart());
$this->assertEquals(new \DateTime('1998-05-18 16:00:00'), $computed[1]->getStart());
$this->assertEquals(new \DateTime('1999-05-17 16:00:00'), $computed[2]->getStart());
}