code: def _start(self):
          
          assert self._tempdir is not None
          assert self._process is None
          self._process = subprocess.Popen(
              [
                  self.paths.slapd,
                  '-f', self._slapd_conf,
                  '-h', self.uri,
                  '-d', str(self.slapd_debug),
              ],
              stdout=sys.stdout,
              stderr=sys.stderr,
          )
          self._poll_slapd(timeout=self.max_server_startup_delay)
docs: Start the server.