https://api.drupal.org/api/drupal/core%21modules%21system%21tests%21src%21Functional%21Theme%21ExperimentalThemeTest.php/property/ExperimentalThemeTest%3A%3AadminUser/9
ExperimentalThemeTest::$adminUser | Drupal API
adminuserdrupalapi
https://api.drupal.org/api/drupal/core%21modules%21system%21tests%21src%21Functional%21Theme%21ExperimentalThemeTest.php/9
ExperimentalThemeTest.php | Drupal API
phpdrupalapi