<?php
 

 namespace Twig\Tests;
 

 /*
  * This file is part of Twig.
  *
  * (c) Fabien Potencier
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
 

 use PHPUnit\Framework\TestCase;

 use Twig\Environment;
 use Twig\Extension\ExtensionInterface;
 use Twig\Loader\LoaderInterface;
 

 class CustomExtensionTest extends TestCase

 {
     /**
      * @dataProvider provideInvalidExtensions
      */

     public function testGetInvalidOperators(ExtensionInterface $extension, $expectedExceptionMessage)

     {

         $this->expectException(\InvalidArgumentException::class);

         $this->expectExceptionMessage($expectedExceptionMessage);

         $env = new Environment($this->createMock(LoaderInterface::class));

         $env->addExtension($extension);

         $env->getUnaryOperators();

     }
 
     public function provideInvalidExtensions()
     {

         return [

             [new InvalidOperatorExtension([1, 2, 3]), '"Twig\Tests\InvalidOperatorExtension::getOperators()" must return an array of 2 elements, got 3.'],

         ];

     }
 }
 

 class InvalidOperatorExtension implements ExtensionInterface

 {
     private $operators;
 
     public function __construct($operators)
     {
         $this->operators = $operators;
     }
 

     public function getTokenParsers(): array

     {

         return [];

     }
 

     public function getNodeVisitors(): array

     {

         return [];

     }
 

     public function getFilters(): array

     {

         return [];

     }
 

     public function getTests(): array

     {

         return [];

     }
 

     public function getFunctions(): array

     {

         return [];

     }
 

     public function getOperators(): array

     {
         return $this->operators;
     }
 }