gecko/mobile/chrome/tests/browser_preferences_fulltoggle.js

// browser-chrome test for fennec preferences to toggle values while clicking on the preference name

var gTests = [];
var gCurrentTest = null;

function test() {
  // The "runNextTest" approach is async, so we need to call "waitForExplicitFinish()"
  // We call "finish()" when the tests are finished
  waitForExplicitFinish();

  // Start the tests
  runNextTest();
}
//------------------------------------------------------------------------------
// Iterating tests by shifting test out one by one as runNextTest is called.
function runNextTest() {
  // Run the next test until all tests completed
  if (gTests.length > 0) {
    gCurrentTest = gTests.shift();
    info(gCurrentTest.desc);
    gCurrentTest.run();
  }
  else {
    // Cleanup. All tests are completed at this point
    finish();
  }
}

// -----------------------------------------------------------------------------------------
// Verify preferences and text
gTests.push({
  desc: "Verify full toggle on Preferences",

  run: function(){
    // 1.Click preferences to view prefs
    document.getElementById("tool-panel-open").click();
    is(document.getElementById("panel-container").hidden, false, "Preferences should be visible");

    var contentRegion = document.getElementById("prefs-content");

    // Check for *Show images*
    var imageRegion = document.getAnonymousElementByAttribute(contentRegion, "pref", "permissions.default.image");
    var imageValue  = imageRegion.value;
    var imageTitle  = document.getAnonymousElementByAttribute(imageRegion, "class", "preferences-title");
    var imageButton = document.getAnonymousElementByAttribute(imageRegion, "anonid", "input");

    var ibEvent = document.createEvent("MouseEvents");
    ibEvent.initEvent("TapSingle", true, false);
    imageButton.dispatchEvent(ibEvent);
    is(imageRegion.value, !imageValue, "Tapping on input control should change the value");

    var itEvent = document.createEvent("MouseEvents");
    itEvent.initEvent("TapSingle", true, false);
    imageTitle.dispatchEvent(itEvent);
    is(imageRegion.value, imageValue, "Tapping on the title should change the value"); 

    var irEvent = document.createEvent("MouseEvents");
    irEvent.initEvent("TapSingle", true, false);
    imageRegion.dispatchEvent(irEvent);
    is(imageRegion.value, !imageValue, "Tapping on the setting should change the value"); 

    BrowserUI.hidePanel();
    is(document.getElementById("panel-container").hidden, true, "Preferences panel should be closed");
    runNextTest();
  }
});