cobalt/black_box_tests/testdata/telemetry_test.html

<!DOCTYPE html>
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  Copyright 2023 The Cobalt Authors. All Rights Reserved.

  Licensed under the Apache License, Version 2.0 (the "License");
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<html>
<head>
  <title>Cobalt Telemetry Test</title>
  <script src='black_box_js_test_utils.js'></script>
</head>
<body>
  <script>
setTimeout(notReached, 20000);
const {metrics} = window.h5vcc;
const now = () => new Date().getTime();
const start = now();
const elapsed = () => now() - start;
const expectedEventCount = 2;

let resolverIndex = 0;
const resolvers = [];
const resolveNext = () => {
  if (resolverIndex >= resolvers.length) {
    notReached('Unexpected event.')
    console.error(`Resolver ${resolverIndex} does not exist.`);
    return;
  }
  resolvers[resolverIndex]();
  resolverIndex++
};
const promises = Array.from({length: expectedEventCount}, () =>
    new Promise(resolve => {
      resolvers.push(resolve);
    }));

window.addEventListener('load', () => {
  metrics.setMetricEventInterval(/*intervalSeconds=*/5);
  metrics.onMetricEvent((metricType, payload) => {
    if (resolverIndex === 0) {
      assertTrue(elapsed() < 4000);
    } else if (resolverIndex === 1) {
      assertTrue(elapsed() > 4000);
      assertTrue(elapsed() < 10000);
    }
    assertTrue(metrics.isEnabled());
    assertEqual('COBALT_UMA', metricType);
    assertTrue(payload.length > 0);
    resolveNext();
  });

  metrics.disable()
    .then(() => {
      assertFalse(metrics.isEnabled());
    }).then(() => metrics.enable())
    .then(() => {
      assertTrue(metrics.isEnabled());
    }).then(() => Promise.all(promises))
    .then(() => metrics.disable())
    .then(() => {
      assertFalse(metrics.isEnabled());
      onEndTest();
    });

  setupFinished();
});
  </script>
</body>
</html>