Popsu-coloque/web/core/modules/system/tests/themes/test_theme_nyan_cat_engine/test_theme_nyan_cat_engine.theme

<?php

/**
 * @file
 * Test theme.
 */

/**
 * Implements hook_preprocess_theme_test_template_test().
 */
function test_theme_nyan_cat_engine_preprocess_theme_test_template_test(&$variables) {
  $variables['kittens'] = 'All of them';
}