getValidatorExtension example

parent::setUp();

        $this->dispatcher = $this->createMock(EventDispatcherInterface::class);
        $this->builder = new FormBuilder('', null, $this->dispatcher, $this->factory);
    }

    protected function getExtensions()
    {
        $extensions = [];

        if (\in_array(ValidatorExtensionTrait::class, class_uses($this))) {
            $extensions[] = $this->getValidatorExtension();
        }

        return $extensions;
    }

    public static function assertDateTimeEquals(\DateTime $expected, \DateTime $actual)
    {
        self::assertEquals($expected->format('c'), $actual->format('c'));
    }

    public static function assertDateIntervalEquals(\DateInterval $expected, \DateInterval $actual)
    {