RequestStackLegacyTest.php

<?php

namespace Drupal\Tests\Core\Http;

use Drupal\Core\Http\RequestStack;
use Drupal\Tests\UnitTestCase;

/**
 * @coversDefaultClass \Drupal\Core\Http\RequestStack
 * @group legacy
 */
class RequestStackLegacyTest extends UnitTestCase {
    
    /**
     * Tests deprecation message in our subclassed RequestStack.
     *
     * @covers ::getMasterRequest
     */
    public function testGetMasterRequestDeprecation() {
        $stack = new RequestStack();
        $this->expectDeprecation('Drupal\\Core\\Http\\RequestStack::getMasterRequest() is deprecated in drupal:9.3.0 and is removed from drupal:10.0.0. Use getMainRequest() instead. See https://www.drupal.org/node/3253744');
        $this->assertNull($stack->getMasterRequest());
    }

}