fune/dom/plugins/test/mochitest/browser_bug1196539.js

var gTestRoot = getRootDirectory(gTestPath).replace(
  "chrome://mochitests/content/",
  "http://127.0.0.1:8888/"
);

function checkPaintCount(aCount) {
  ok(
    aCount != 0,
    "paint count can't be greater than zero, count was " + aCount
  );
  ok(
    aCount < kMaxPaints,
    "paint count should be within limits, count was " + aCount
  );
}

// maximum number of paints we allow before failing. The test plugin doesn't
// animate so this should really be just 1, but operating systems can
// occasionally fire a few of these so we give these tests a fudge factor.
// A bad regression would either be 0, or 100+.
const kMaxPaints = 10;

add_task(async function() {
  let result, tabSwitchedPromise;

  // We want to make sure that we will paint in cases where we need to. The
  // tab layer cache just gets in the way of measuring that.
  await SpecialPowers.pushPrefEnv({
    set: [["browser.tabs.remote.tabCacheSize", 0]],
  });

  setTestPluginEnabledState(Ci.nsIPluginTag.STATE_ENABLED, "Test Plug-in");

  let pluginTab = await BrowserTestUtils.openNewForegroundTab(
    gBrowser,
    gTestRoot + "plugin_test.html"
  );
  let homeTab = await BrowserTestUtils.openNewForegroundTab(
    gBrowser,
    "about:home"
  );

  result = await SpecialPowers.spawn(
    pluginTab.linkedBrowser,
    [],
    async function() {
      let doc = content.document;
      let plugin = doc.getElementById("testplugin");
      return !!plugin;
    }
  );
  is(result, true, "plugin is loaded");

  result = await SpecialPowers.spawn(
    pluginTab.linkedBrowser,
    [],
    async function() {
      let doc = content.document;
      let plugin = doc.getElementById("testplugin");
      return !XPCNativeWrapper.unwrap(plugin).nativeWidgetIsVisible();
    }
  );
  is(result, true, "plugin is hidden");

  // reset plugin paint count
  await SpecialPowers.spawn(pluginTab.linkedBrowser, [], async function() {
    let doc = content.document;
    let plugin = doc.getElementById("testplugin");
    XPCNativeWrapper.unwrap(plugin).resetPaintCount();
  });

  // select plugin tab
  tabSwitchedPromise = waitTabSwitched();
  gBrowser.selectedTab = pluginTab;
  await tabSwitchedPromise;

  // wait a bit for spurious paints
  await waitForMs(100);

  result = await SpecialPowers.spawn(
    pluginTab.linkedBrowser,
    [],
    async function() {
      let doc = content.document;
      let plugin = doc.getElementById("testplugin");
      return XPCNativeWrapper.unwrap(plugin).nativeWidgetIsVisible();
    }
  );
  is(result, true, "plugin is visible");

  // check for good paint count
  result = await SpecialPowers.spawn(
    pluginTab.linkedBrowser,
    [],
    async function() {
      let doc = content.document;
      let plugin = doc.getElementById("testplugin");
      return XPCNativeWrapper.unwrap(plugin).getPaintCount();
    }
  );
  checkPaintCount(result);

  // select home tab
  tabSwitchedPromise = waitTabSwitched();
  gBrowser.selectedTab = homeTab;
  await tabSwitchedPromise;

  // reset paint count
  await SpecialPowers.spawn(pluginTab.linkedBrowser, [], async function() {
    let doc = content.document;
    let plugin = doc.getElementById("testplugin");
    XPCNativeWrapper.unwrap(plugin).resetPaintCount();
  });

  // wait a bit for spurious paints
  await waitForMs(100);

  // check for no paint count
  result = await SpecialPowers.spawn(
    pluginTab.linkedBrowser,
    [],
    async function() {
      let doc = content.document;
      let plugin = doc.getElementById("testplugin");
      return XPCNativeWrapper.unwrap(plugin).getPaintCount();
    }
  );
  is(result, 0, "no paints, this is correct.");

  result = await SpecialPowers.spawn(
    pluginTab.linkedBrowser,
    [],
    async function() {
      let doc = content.document;
      let plugin = doc.getElementById("testplugin");
      return !XPCNativeWrapper.unwrap(plugin).nativeWidgetIsVisible();
    }
  );
  is(result, true, "plugin is hidden");

  // reset paint count
  await SpecialPowers.spawn(pluginTab.linkedBrowser, [], async function() {
    let doc = content.document;
    let plugin = doc.getElementById("testplugin");
    XPCNativeWrapper.unwrap(plugin).resetPaintCount();
  });

  // select plugin tab
  tabSwitchedPromise = waitTabSwitched();
  gBrowser.selectedTab = pluginTab;
  await tabSwitchedPromise;

  // check paint count
  result = await SpecialPowers.spawn(
    pluginTab.linkedBrowser,
    [],
    async function() {
      let doc = content.document;
      let plugin = doc.getElementById("testplugin");
      return XPCNativeWrapper.unwrap(plugin).getPaintCount();
    }
  );
  checkPaintCount(result);

  gBrowser.removeTab(homeTab);
  gBrowser.removeTab(pluginTab);
});