coffee-8.x-1.x-dev/tests/modules/coffee_test/coffee_test.module

<?php

/**
 * @file
 * A test module for test the coffee module.
 */

use Drupal\Core\Url;

/**
 * Implements hook_coffee_commands().
 */
function coffee_test_coffee_commands() {
  $commands[] = [
    'value' => Url::fromRoute('<front>')->toString(),
    'label' => t('Coffee hook fired!'),
    'command' => ':test',
  ];

  return $commands;
}