public function testContainsNodeId()
 {
     $contained_node = $this->node_array[0];
     $not_contained_node = KademliaTestFactory::constructNode();
     $node_list = new Kademlia\NodeList($this->node_array);
     $this->assertTrue($node_list->containsNodeId($contained_node->idBin()));
     $this->assertFalse($node_list->containsNodeId($not_contained_node->idStr()));
 }