ConfigSchemaDeprecationTest.php

<?php

namespace Drupal\KernelTests\Core\Config;

use Drupal\KernelTests\KernelTestBase;

/**
 * Tests config schema deprecation.
 *
 * @group config
 * @group legacy
 */
class ConfigSchemaDeprecationTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'config_schema_deprecated_test',
    ];
    
    /**
     * Tests config schema deprecation.
     */
    public function testConfigSchemaDeprecation() {
        $this->expectDeprecation('The \'complex_structure_deprecated\' config schema is deprecated in drupal:9.1.0 and is removed from drupal 10.0.0. Use the \'complex_structure\' config schema instead. See http://drupal.org/node/the-change-notice-nid.');
        $config = $this->config('config_schema_deprecated_test.settings');
        $config->set('complex_structure_deprecated.type', 'fruits')
            ->set('complex_structure_deprecated.products', [
            'apricot',
            'apple',
        ])
            ->save();
        $this->assertSame([
            'type' => 'fruits',
            'products' => [
                'apricot',
                'apple',
            ],
        ], $config->get('complex_structure_deprecated'));
    }

}