public function testKeysAncestors()
{
$ancestors = [['kind' => 'Parent1', 'id' => '123'], ['kind' => 'Parent2', 'id' => '321']];
$keys = $this->datastore->keys('Person', ['allocateIds' => false, 'ancestors' => $ancestors]);
$key = $keys[0];
$keyAncestors = $key->keyObject()['path'];
array_pop($keyAncestors);
$this->assertEquals($keyAncestors, $ancestors);
}