public function testPassingNullWhenSettingPluginManagerResetsPluginManager()
 {
     $plugins = new ValidatorPluginManager();
     StaticValidator::setPluginManager($plugins);
     $this->assertSame($plugins, StaticValidator::getPluginManager());
     StaticValidator::setPluginManager(null);
     $this->assertNotSame($plugins, StaticValidator::getPluginManager());
 }