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import { assert } from "../testing/asserts.ts";
function* portIterator(): IterableIterator<number> {  // use 55001 ~ 65535 (rest (49152~55000) are for cli/js)  let i = 55001;  while (true) {    yield i;    i++;    if (i > 65535) {      i = 55001;    }  }}const it = portIterator();/** Obtain (maybe) safe port number for net tests */export function randomPort(): number {  const { value } = it.next();  assert(value != null);  return value;}