test_HeapSnapshot_describeNode_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 we can describe nodes with a breakdown.

function run_test() {

  const path = saveNewHeapSnapshot();

  const snapshot = ChromeUtils.readHeapSnapshot(path);

  ok(snapshot.describeNode);

  equal(typeof snapshot.describeNode, "function");

  const dt = snapshot.computeDominatorTree();

  let threw = false;

  try {

    snapshot.describeNode(undefined, dt.root);

  } catch (_) {

    threw = true;

  ok(threw, "Should require a breakdown");

  const breakdown = {

    by: "coarseType",

    objects: { by: "objectClass" },

    scripts: { by: "internalType" },

    strings: { by: "internalType" },

    other: { by: "internalType" },

};

  threw = false;

  try {

    snapshot.describeNode(breakdown, 0);

  } catch (_) {

    threw = true;

  ok(threw, "Should throw when given an invalid node id");

  const description = snapshot.describeNode(breakdown, dt.root);

  ok(description);

  ok(description.other);

  ok(description.other["JS::ubi::RootList"]);