browser_inspector-release.js

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/* Any copyright is dedicated to the Public Domain.

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

"use strict";

Services.scriptloader.loadSubScript(

  "chrome://mochitests/content/browser/devtools/server/tests/browser/inspector-helpers.js",

  this

);

add_task(async function loadNewChild() {

  const { target, walker } = await initInspectorFront(

    MAIN_DOMAIN + "inspector-traversal-data.html"

);

  let originalOwnershipSize = 0;

  let longlist = null;

  let firstChild = null;

  const list = await walker.querySelectorAll(walker.rootNode, "#longlist div");

  // Make sure we have the 26 children of longlist in our ownership tree.

  is(list.length, 26, "Expect 26 div children.");

  // Make sure we've read in all those children and incorporated them

  // in our ownership tree.

  const items = await list.items();

  originalOwnershipSize = await assertOwnershipTrees(walker);

  // Here is how the ownership tree is summed up:

  // #document                      1

  //   <html>                       1

  //     <body>                     1

  //       <div id=longlist>        1

  //         <div id=a>a</div>   26*2 (each child plus it's singleTextChild)

  //         ...

  //         <div id=z>z</div>

  //                             -----

  //                               56

  is(originalOwnershipSize, 56, "Correct number of items in ownership tree");

  firstChild = items[0].actorID;

  // Now get the longlist and release it from the ownership tree.

  const node = await walker.querySelector(walker.rootNode, "#longlist");

  longlist = node.actorID;

  await walker.releaseNode(node);

  // Our ownership size should now be 53 fewer

  // (we forgot about #longlist + 26 children + 26 singleTextChild nodes)

  const newOwnershipSize = await assertOwnershipTrees(walker);

is(

    newOwnershipSize,

    originalOwnershipSize - 53,

    "Ownership tree should be lower"

);

  // Now verify that some nodes have gone away

  await checkMissing(target, longlist);

  await checkMissing(target, firstChild);

});