public function testIsEven()
{
$col = new Collection();
$this->assertTrue($col->isEven(), 'isEven() returns true on an empty collection');
$data = array('bar1', 'bar2', 'bar3');
$col = new Collection();
$col->setData($data);
foreach ($col as $key => $value) {
$this->assertEquals(!(bool) ($key % 2), $col->isEven(), 'isEven() returns true only when the key is even');
}
}
