fune/browser/components/preferences/in-content-old/tests/browser_bug1018066_resetScrollPosition.js

/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/ */

var originalWindowHeight;
registerCleanupFunction(function() {
  window.resizeTo(window.outerWidth, originalWindowHeight);
  while (gBrowser.tabs[1])
    gBrowser.removeTab(gBrowser.tabs[1]);
});

add_task(function*() {
  originalWindowHeight = window.outerHeight;
  window.resizeTo(window.outerWidth, 300);
  let prefs = yield openPreferencesViaOpenPreferencesAPI("paneApplications", undefined, {leaveOpen: true});
  is(prefs.selectedPane, "paneApplications", "Applications pane was selected");
  let mainContent = gBrowser.contentDocument.querySelector(".main-content");
  mainContent.scrollTop = 50;
  is(mainContent.scrollTop, 50, "main-content should be scrolled 50 pixels");

  gBrowser.contentWindow.gotoPref("paneGeneral");
  is(mainContent.scrollTop, 0,
     "Switching to a different category should reset the scroll position");
});