AuditException example

  public function audit(MigrationInterface $migration) {
    // If the migration does not opt into auditing, it passes.     if (!$migration->isAuditable()) {
      return AuditResult::pass($migration);
    }

    $interface = HighestIdInterface::class;

    $destination = $migration->getDestinationPlugin();
    if (!$destination instanceof HighestIdInterface) {
      throw new AuditException($migration, "Destination does not implement $interface");
    }

    $id_map = $migration->getIdMap();
    if (!$id_map instanceof HighestIdInterface) {
      throw new AuditException($migration, "ID map does not implement $interface");
    }

    if ($destination->getHighestId() > $id_map->getHighestId() || ($destination instanceof EntityContentComplete && !$this->auditEntityComplete($migration))) {
      return AuditResult::fail($migration, [
        $this->t('The destination system contains data which was not created by a migration.'),
      ]);
    }