public function testMergeIsNotUnique()
{
$collection2 = new \Spot\Entity\Collection();
$this->collection->add(new Entity_Post(array('foo' => 'bar')));
$collection2->add(new Entity_Post(array('foo' => 'bar')));
$collection2->add(new Entity_Post());
$collection2->merge($this->collection, false);
$this->assertEquals(3, count($collection2));
}