ConfigurablePluginInterfaceTest.php

<?php

namespace Drupal\Tests\Component\Plugin;

use Drupal\Component\Plugin\ConfigurablePluginInterface;
use Drupal\Component\Plugin\PluginBase;
use PHPUnit\Framework\TestCase;

/**
 * Tests ConfigurablePluginInterface deprecation.
 *
 * @group legacy
 * @group plugin
 */
class ConfigurablePluginInterfaceTest extends TestCase {
    
    /**
     * Tests the deprecation error is thrown.
     *
     * @expectedDeprecation Drupal\Component\Plugin\ConfigurablePluginInterface is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0. You should implement ConfigurableInterface and/or DependentPluginInterface directly as needed. If you implement ConfigurableInterface you may choose to implement ConfigurablePluginInterface in Drupal 8 as well for maximum compatibility, however this must be removed prior to Drupal 9. See https://www.drupal.org/node/2946161
     */
    public function testDeprecation() {
        new ConfigurablePluginInterfaceTestClass([], '', []);
    }

}

/**
 * Test Class to trigger deprecation error.
 */
class ConfigurablePluginInterfaceTestClass extends PluginBase implements ConfigurablePluginInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getConfiguration() {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function setConfiguration(array $configuration) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function defaultConfiguration() {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function calculateDependencies() {
        return [];
    }

}