test_HeapAnalyses_takeCensusDiff_01.js

Enable keyboard shortcuts

/* Any copyright is dedicated to the Public Domain.

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

"use strict";

// Test that the HeapAnalyses{Client,Worker} can take diffs between censuses.

const BREAKDOWN = {

  by: "objectClass",

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

  other: { by: "count", count: true, bytes: false },

};

add_task(async function () {

  const client = new HeapAnalysesClient();

  const markers = [allocationMarker()];

  const firstSnapshotFilePath = saveNewHeapSnapshot();

  // Allocate and hold an additional AllocationMarker object so we can see it in

  // the next heap snapshot.

  markers.push(allocationMarker());

  const secondSnapshotFilePath = saveNewHeapSnapshot();

  await client.readHeapSnapshot(firstSnapshotFilePath);

  await client.readHeapSnapshot(secondSnapshotFilePath);

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

  const { delta } = await client.takeCensusDiff(

    firstSnapshotFilePath,

    secondSnapshotFilePath,

    { breakdown: BREAKDOWN }

);

  equal(

    delta.AllocationMarker.count,

1,

    "There exists one new AllocationMarker in the second heap snapshot"

);

  const { delta: deltaTreeNode } = await client.takeCensusDiff(

    firstSnapshotFilePath,

    secondSnapshotFilePath,

    { breakdown: BREAKDOWN },

    { asTreeNode: true }

);

  // Have to manually set these because symbol properties aren't structured

  // cloned.

  delta[CensusUtils.basisTotalBytes] = deltaTreeNode.totalBytes;

  delta[CensusUtils.basisTotalCount] = deltaTreeNode.totalCount;

  compareCensusViewData(

    BREAKDOWN,

    delta,

    deltaTreeNode,

    "Returning delta-census as a tree node represents same data as the report"

);

  client.destroy();

});