function testImportResetsExistingMany2ManyCollection()
{
$group = new GroupForTest();
$group->setTitle('Some group');
$u1 = new UserForTest();
$u1->setFirstName('Bob');
$u2 = new UserForTest();
$u2->setFirstName('John');
$group->addToUsers($u1);
$group->addToUsers($u2);
$group->save();
$source = array('title' => $group->getTitle(), 'users' => array($u2->getId()));
$group2 = new GroupForTest($group->getId());
$group2->import($source);
$this->assertEqual($group2->getTitle(), $group->getTitle());
$this->assertEqual($group2->getUsers()->count(), 1);
$this->assertEqual($group2->getUsers()->at(0)->getFirstName(), $u2->getFirstName());
}