$this->assertTrue($keys_are_field_names&&$values_are_expected_access_denied_reasons,'In Drupal 8.6, the structure of $patchProtectectedFieldNames changed. It used to be an array with field names as values. Now those values are the keys, and their values should be either NULL or a string: a string containing the reason for why the field cannot be PATCHed, or NULL otherwise.');
$this->assertTrue($keys_are_field_names&&$values_are_expected_access_denied_reasons,'In Drupal 8.6, the structure of $patchProtectedFieldNames changed. It used to be an array with field names as values. Now those values are the keys, and their values should be either NULL or a string: a string containing the reason for why the field cannot be PATCHed, or NULL otherwise.');