public function testSerializationDeserialization()
{
$obj = new PlanList(self::getJson());
$this->assertNotNull($obj);
$this->assertNotNull($obj->getPlans());
$this->assertNotNull($obj->getTotalItems());
$this->assertNotNull($obj->getTotalPages());
$this->assertNotNull($obj->getLinks());
$this->assertEquals(self::getJson(), $obj->toJson());
return $obj;
}