PhpUnitBridgeTest.php

<?php

namespace Drupal\KernelTests\Core\Test;

use Drupal\KernelTests\KernelTestBase;
use Drupal\deprecation_test\Deprecation\FixtureDeprecatedClass;

/**
 * Test how kernel tests interact with deprecation errors.
 *
 * @group Test
 * @group legacy
 */
class PhpUnitBridgeTest extends KernelTestBase {
    protected static $modules = [
        'deprecation_test',
    ];
    public function testDeprecatedClass() {
        $this->expectDeprecation('Drupal\\deprecation_test\\Deprecation\\FixtureDeprecatedClass is deprecated.');
        $deprecated = new FixtureDeprecatedClass();
        $this->assertEquals('test', $deprecated->testFunction());
    }
    public function testDeprecatedFunction() {
        $this->expectDeprecation('This is the deprecation message for deprecation_test_function().');
        $this->assertEquals('known_return_value', \deprecation_test_function());
    }

}