public function testPassingNullWhenSettingBrokerResetsBroker()
 {
     $broker = new PluginBroker();
     Validator\StaticValidator::setBroker($broker);
     $this->assertSame($broker, Validator\StaticValidator::getBroker());
     Validator\StaticValidator::setBroker(null);
     $this->assertNotSame($broker, Validator\StaticValidator::getBroker());
 }