diff -r 000000000000 -r 6474c204b198 addon-sdk/source/test/addons/private-browsing-supported/test-panel.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/test/addons/private-browsing-supported/test-panel.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,98 @@
+'use strict';
+
+const { open, focus, close } = require('sdk/window/helpers');
+const { isPrivate } = require('sdk/private-browsing');
+const { defer } = require('sdk/core/promise');
+const { browserWindows: windows } = require('sdk/windows');
+
+const BROWSER = 'chrome://browser/content/browser.xul';
+
+exports.testRequirePanel = function(assert) {
+  require('sdk/panel');
+  assert.ok('the panel module should not throw an error');
+};
+
+exports.testShowPanelInPrivateWindow = function(assert, done) {
+  let panel = require('sdk/panel').Panel({
+    contentURL: "data:text/html;charset=utf-8,"
+  });
+
+  assert.ok(windows.length > 0, 'there is at least one open window');
+  for (let window of windows) {
+    assert.equal(isPrivate(window), false, 'open window is private');
+  }
+
+  testShowPanel(assert, panel).
+    then(makeEmptyPrivateBrowserWindow).
+    then(focus).
+    then(function(window) {
+      assert.equal(isPrivate(window), true, 'opened window is private');
+      assert.pass('private window was focused');
+      return window;
+    }).
+    then(function(window) {
+      let { promise, resolve } = defer();
+
+      assert.ok(!panel.isShowing, 'the panel is not showing [1]');
+
+      panel.once('show', function() {
+        assert.ok(panel.isShowing, 'the panel is showing');
+
+        panel.once('hide', function() {
+          assert.ok(!panel.isShowing, 'the panel is not showing [2]');
+
+          resolve(window);
+        });
+
+        panel.hide();
+      });
+
+      panel.show();
+
+      return promise;
+    }).
+    then(close).
+    then(done).
+    then(null, assert.fail);
+};
+
+
+function makeEmptyPrivateBrowserWindow(options) {
+  options = options || {};
+  return open(BROWSER, {
+    features: {
+      chrome: true,
+      toolbar: true,
+      private: true
+    }
+  });
+}
+
+function testShowPanel(assert, panel) {
+  let { promise, resolve } = defer();
+  let shown = false;
+
+  assert.ok(!panel.isShowing, 'the panel is not showing [1]');
+
+  panel.once('hide', function() {
+    assert.ok(!panel.isShowing, 'the panel is not showing [2]');
+    assert.ok(shown, 'the panel was shown')
+
+    resolve(null);
+  });
+
+  panel.once('show', function() {
+    shown = true;
+
+    assert.ok(panel.isShowing, 'the panel is showing');
+
+    panel.hide();
+  });
+
+  panel.show();
+
+  return promise;
+}
+
+//Test disabled because of bug 911071
+module.exports = {}