https://api.drupal.org/api/drupal/core%21modules%21config%21tests%21src%21Functional%21ConfigDependencyWebTest.php/8.9.x
ConfigDependencyWebTest.php | Drupal API
phpdrupalapi
https://api.drupal.org/api/drupal/core%21modules%21config%21tests%21src%21Functional%21ConfigDependencyWebTest.php/property/ConfigDependencyWebTest%3A%3AdefaultTheme/9
ConfigDependencyWebTest::$defaultTheme | Drupal API
drupalapi