https://api.drupal.org/api/drupal/core%21tests%21Drupal%21Tests%21Core%21Common%21TagsTest.php/property/TagsTest%3A%3AvalidTags/10
TagsTest::$validTags | Drupal API
drupalapi
https://api.drupal.org/api/drupal/core%21tests%21Drupal%21Tests%21Core%21Common%21TagsTest.php/function/TagsTest%3A%3AassertTags/9
function TagsTest::assertTags | Drupal API
functiondrupalapi