@DisplayName("start throw NullPointerException with null acceptor")
@Test
void startNullAcceptor() {

  assertThatNullPointerException()
      .isThrownBy(
          () ->
              new WebsocketRouteTransport(HttpServer.create(), routes -> {}, "/test-path")
                  .start(null))
      .withMessage("acceptor must not be null");
}