update

test/adaptive-poll.test.js

@@ -0,0 +1,20 @@
+'use strict';
+const assert = require('node:assert');
+const { computePollMs } = require('../lib/adaptive-poll.js');
+
+let passed = 0;
+function check(name, fn) {
+  try { fn(); console.log('  ok -', name); passed++; }
+  catch (e) { console.error('  FAIL -', name, e.message); process.exitCode = 1; }
+}
+
+check('visible returns base interval', () => {
+  assert.strictEqual(computePollMs(1000, true), 1000);
+});
+
+check('hidden doubles the interval, capped at 4s', () => {
+  assert.strictEqual(computePollMs(500, false), 1000);
+  assert.strictEqual(computePollMs(1000, false), 2000);
+  assert.strictEqual(computePollMs(2000, false), 4000);
+  assert.strictEqual(computePollMs(2000, false, { cap: 3000 }), 3000);
+});