public function testSeriesEnd()
{
$dr1 = new DateRange(new DateTime('2006-07-08'), new DateTime('2006-09-05'));
$dr2 = new DateRange(new DateTime('2006-09-06'), new DateTime('2006-09-15'));
$dr3 = new DateRange(new DateTime('2006-09-15'), new DateTime('2006-09-25'));
$this->assertEquals(new DateTime('2006-09-25'), DateRange::getSeriesEnd(array($dr1, $dr2, $dr3)));
}
