ConfigurablePluginBaseTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\Core\Plugin;

use Drupal\Core\Plugin\ConfigurablePluginBase;
use PHPUnit\Framework\TestCase;

/**
 * Tests ConfigurablePluginBase.
 *
 * @group Plugin
 *
 * @coversDefaultClass \Drupal\Core\Plugin\ConfigurablePluginBase
 */
class ConfigurablePluginBaseTest extends TestCase {
    
    /**
     * Tests the Constructor.
     */
    public function testConstructor() : void {
        $provided_configuration = [
            'foo' => 'bar',
        ];
        $merged_configuration = [
            'default' => 'default',
        ] + $provided_configuration;
        $plugin = new ConfigurablePluginBaseTestClass($provided_configuration, '', []);
        $this->assertSame($merged_configuration, $plugin->getConfiguration());
    }

}

/**
 * Test class for ConfigurablePluginBase.
 */
class ConfigurablePluginBaseTestClass extends ConfigurablePluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function defaultConfiguration() : array {
        return [
            'default' => 'default',
        ];
    }

}