TestContextAwareNoValidContextOptionsBlock.php

<?php

namespace Drupal\block_test\Plugin\Block;

use Drupal\Core\Block\Attribute\Block;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Plugin\Context\ContextDefinition;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Provides a context-aware block that uses a not-passed, non-required context.
 */
class TestContextAwareNoValidContextOptionsBlock extends BlockBase {
    
    /**
     * {@inheritdoc}
     */
    public function build() {
        return [
            '#markup' => 'Rendered block with no valid context options',
        ];
    }

}