no-gc-with-eventlisteners.https.html

<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/test-only-api.js"></script>
<script src="/battery-status/resources/battery-status-helpers.js"></script>
</head>
<body>
<script>
battery_status_test(async (t, mockBatteryMonitor) => {
  mockBatteryMonitor.setBatteryStatus(false, 10, 20, 0.5);

  let battery = await navigator.getBattery();
  const newLevel = 0.6;
  const levelChange =
      new Promise(resolve => battery.addEventListener('levelchange', resolve));
  battery = null;
  gc();

  mockBatteryMonitor.setBatteryStatus(false, 10, 20, newLevel);
  await levelChange;
}, 'BatteryManager object is not garbage-collected with listeners attached');
</script>
</body>
</html>

chromium/third_party/blink/web_tests/wpt_internal/battery-status/no-gc-with-eventlisteners.https.html