third_party/WebKit/LayoutTests/http/tests/devtools/elements/styles-4/styles-live-locations-leak.js

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

(async function() {
  TestRunner.addResult(`Tests that styles sidebar pane does not leak any LiveLocations.\n`);
  await TestRunner.loadModule('elements_test_runner');
  await TestRunner.showPanel('elements');
  await TestRunner.loadHTML(`
      <style>
      #first {
          color: blue;
      }

      #second {
          line-height: 1em;
          border: 1px solid black;
      }

      #third {
          margin: 1px 1px 0 0;
          padding: 10px;
          background-color: blue;
          border: 1px solid black;
      }
      </style>
      <div id="first">First element to select</div>
      <div id="second">Second element to select</div>
      <div id="third">Second element to select</div>
    `);

  var initialLiveLocationsCount;
  TestRunner.runTestSuite([
    function selectInitialNode(next) {
      ElementsTestRunner.selectNodeAndWaitForStylesWithComputed('first', next);
    },

    function saveInitialLiveLocationsCount(next) {
      initialLiveLocationsCount = countLiveLocations();
      next();
    },

    function rebuildStylesSidebarPaneMultipleTimes(next) {
      var elementsToSelect = ['second', 'third', 'second', 'first', 'third', 'first'];
      function loopThroughElements() {
        if (!elementsToSelect.length) {
          next();
          return;
        }
        ElementsTestRunner.selectNodeAndWaitForStylesWithComputed(elementsToSelect.shift(), loopThroughElements);
      }
      loopThroughElements();
    },

    function compareLiveLocationsCount(next) {
      var liveLocationsCount = countLiveLocations();
      if (liveLocationsCount !== initialLiveLocationsCount)
        TestRunner.addResult(String.sprintf(
            'ERROR: LiveLocations count is growing! Expected: %d found: %d', initialLiveLocationsCount,
            liveLocationsCount));
      else
        TestRunner.addResult('SUCCESS: LiveLocations count do not grow.');
      next();
    }
  ]);

  function countLiveLocations() {
    var locationsCount = 0;
    var modelInfos = Bindings.cssWorkspaceBinding._modelToInfo.valuesArray();
    for (var modelInfo of modelInfos)
      locationsCount += modelInfo._locations.valuesArray().length;
    return locationsCount;
  }
})();