test_HeapAnalyses_getCreationTime_01.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Test that the HeapAnalyses{Client,Worker} can get a HeapSnapshot's

// creation time.

function waitForThirtyMilliseconds() {

  const start = Date.now();

  while (Date.now() - start < 30) {

    // do nothing

const BREAKDOWN = {

  by: "internalType",

  then: { by: "count", count: true, bytes: true },

};

add_task(async function () {

  const client = new HeapAnalysesClient();

  const start = Date.now() * 1000;

  // Because Date.now() is less precise than the snapshot's time stamp, give it

  // a little bit of head room. Additionally, WinXP's timers have a granularity

  // of only +/-15 ms.

  waitForThirtyMilliseconds();

  const snapshotFilePath = saveNewHeapSnapshot();

  waitForThirtyMilliseconds();

  const end = Date.now() * 1000;

  await client.readHeapSnapshot(snapshotFilePath);

  ok(true, "Should have read the heap snapshot");

  let threw = false;

  try {

    await client.getCreationTime("/not/a/real/path", {

      breakdown: BREAKDOWN,

});

  } catch (_) {

    threw = true;

  ok(threw, "getCreationTime should throw when snapshot does not exist");

  const time = await client.getCreationTime(snapshotFilePath, {

    breakdown: BREAKDOWN,

});

  dumpn("Start = " + start);

  dumpn("End   = " + end);

  dumpn("Time  = " + time);

  Assert.greaterOrEqual(time, start, "creation time occurred after start");

  Assert.lessOrEqual(time, end, "creation time occurred before end");

  client.destroy();

});