gecko/mobile/chrome/tests/browser_mainui.js

// Very basic tests for the main window UI

const Cc = Components.classes;
const Ci = Components.interfaces;

//------------------------------------------------------------------------------
// Entry point (must be named "test")
function test() {
  is(window.location.href, "chrome://browser/content/browser.xul", "Main window should be browser.xul");

  window.focus();

  let browser = Browser.selectedBrowser;
  isnot(browser, null, "Should have a browser");

  is(browser.currentURI.spec, Browser.selectedTab.browser.currentURI.spec, "selectedBrowser == selectedTab.browser");

  testContentContainerSize();
}

function testContentContainerSize() {
  let container = document.getElementById("content-viewport");

  let rect = container.getBoundingClientRect();
  is(rect.width, window.innerWidth, "Content container is same width as window");
  is(rect.height, window.innerHeight, "Content container is same height as window");
}