import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

addon-sdk/source/test/private-browsing/tabs.js

@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+const { Ci } = require('chrome');
+const { openTab, closeTab } = require('sdk/tabs/utils');
+const { browserWindows } = require('sdk/windows');
+const { isPrivate } = require('sdk/private-browsing');
+
+exports.testIsPrivateOnTab = function(assert) {
+  let window = browserWindows.activeWindow;
+  assert.ok(!isPrivate(chromeWindow), 'the top level window is not private');
+
+  let rawTab = openTab(chromeWindow, 'data:text/html,<h1>Hi!</h1>', {
+    isPrivate: true
+  });
+
+  // test that the tab is private
+  assert.ok(rawTab.browser.docShell.QueryInterface(Ci.nsILoadContext).usePrivateBrowsing);
+  assert.ok(isPrivate(rawTab.browser.contentWindow));
+  assert.ok(isPrivate(rawTab.browser));
+
+  closeTab(rawTab);
+};