<?php

/**
 * @file
 * Provides test contextual link on blocks.
 */

use Drupal\Core\Block\BlockPluginInterface;

/**
 * Implements hook_block_view_alter().
 */
function contextual_test_block_view_alter(array &$build, BlockPluginInterface $block) {
  $build['#contextual_links']['contextual_test'] = [
    'route_parameters' => [],
  ];
}