com.ceilidhkit/App/TwigTests/TwigTests.php

<?php
// src/Twig/AppExtension.php
namespace App\TwigTests;

use Twig\Extension\AbstractExtension;
use Twig\TwigTest;

class TwigTests extends AbstractExtension
{
    public function getTests()
    {
        return array(
            new TwigTest('object', [$this, 'isObject']),
            new TwigTest('array', [$this, 'isArray']),
            new TwigTest('numeric', [$this, 'isNumeric']),
        );
    }

    public function isObject($object)
    {
        return is_object($object);
    }

    public function isArray($value)
    {
        return is_array($value);
    }

    public function isNumeric($value)
    {
        return is_numeric($value);
    }
}