import assert from 'node:assert/strict';
import test from 'node:test';

import { createRequestGate } from '../src/utils/requestGate.js';

test('only the newest request may update the page', () => {
  const gate = createRequestGate();
  const oldRequest = gate.begin();
  const newRequest = gate.begin();

  assert.equal(gate.isCurrent(oldRequest), false);
  assert.equal(gate.isCurrent(newRequest), true);
});

test('sync invalidates every request that started before cache clearing', () => {
  const gate = createRequestGate();
  const beforeSync = gate.begin();

  gate.invalidate();

  assert.equal(gate.isCurrent(beforeSync), false);
  const freshSnapshot = gate.begin();
  assert.equal(gate.isCurrent(freshSnapshot), true);
});