Club Drupal

  /**

   * Tests that hook_flush_caches() is not invoked on every single cron run.

   *

   * @see system_cron()

   */

  public function testCronCacheExpiration() {

    module_enable(array('system_cron_test'));

    variable_del('system_cron_test_flush_caches');

    // Invoke cron the first time: hook_flush_caches() should be called and then

    // get cached.

    drupal_cron_run();

    $this->assertEqual(variable_get('system_cron_test_flush_caches'), 1, 'hook_flush_caches() was invoked the first time.');

    $cache = cache_get('system_cache_tables');

    $this->assertEqual(empty($cache), FALSE, 'Cache is filled with cache table data.');

    // Run cron again and ensure that hook_flush_caches() is not called.

    variable_del('system_cron_test_flush_caches');

    drupal_cron_run();

    $this->assertNull(variable_get('system_cron_test_flush_caches'), 'hook_flush_caches() was not invoked the second time.');

  }