diff -r 000000000000 -r 6474c204b198 addon-sdk/source/test/addons/private-browsing-supported/test-page-mod.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/test/addons/private-browsing-supported/test-page-mod.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,111 @@
+const { getMostRecentBrowserWindow } = require('sdk/window/utils');
+const { PageMod } = require("sdk/page-mod");
+const { getActiveTab, setTabURL, openTab, closeTab } = require('sdk/tabs/utils');
+const xulApp = require('sdk/system/xul-app');
+const windowHelpers = require('sdk/window/helpers');
+const { defer } = require("sdk/core/promise");
+const { isPrivate } = require('sdk/private-browsing');
+const { isTabPBSupported, isWindowPBSupported } = require('sdk/private-browsing/utils');
+
+function openWebpage(url, enablePrivate) {
+  let { promise, resolve, reject } = defer();
+
+  if (xulApp.is("Fennec")) {
+    let chromeWindow = getMostRecentBrowserWindow();
+    let rawTab = openTab(chromeWindow, url, {
+      isPrivate: enablePrivate
+    });
+
+    resolve(function() {
+      closeTab(rawTab)
+    });
+
+    return promise;
+  }
+  else {
+    windowHelpers.open("", {
+      features: {
+        toolbar: true,
+        private: enablePrivate
+      }
+    }).then(function(chromeWindow) {
+      if (isPrivate(chromeWindow) !== !!enablePrivate)
+        reject(new Error("Window should have Private set to " + !!enablePrivate));
+
+      let tab = getActiveTab(chromeWindow);
+      setTabURL(tab, url);
+
+      resolve(function(){
+        windowHelpers.close(chromeWindow);
+      });
+    });
+
+    return promise;
+  }
+}
+
+exports["test page-mod on private tab"] = function (assert, done) {
+  // Only set private mode when explicitely supported.
+  // (fennec 19 has some intermediate PB support where isTabPBSupported
+  // will be false, but isPrivate(worker.tab) will be true if we open a private
+  // tab)
+  let setPrivate = isTabPBSupported || isWindowPBSupported;
+
+  let id = Date.now().toString(36);
+  let frameUri = "data:text/html;charset=utf-8," + id;
+  let uri = "data:text/html;charset=utf-8," +
+            encodeURIComponent(id + "<iframe src='" + frameUri + "'><iframe>");
+
+  let count = 0;
+
+  openWebpage(uri, setPrivate).then(function(close) {
+    PageMod({
+      include: [uri, frameUri],
+
+      onAttach: function(worker) {
+        assert.ok(worker.tab.url == uri || worker.tab.url == frameUri,
+                  "Got a worker attached to the private window tab");
+
+        if (setPrivate) {
+          assert.ok(isPrivate(worker), "The worker is really private");
+          assert.ok(isPrivate(worker.tab), "The document is really private");
+        }
+        else {
+          assert.ok(!isPrivate(worker),
+                    "private browsing isn't supported, " +
+                    "so that the worker isn't private");
+          assert.ok(!isPrivate(worker.tab),
+                    "private browsing isn't supported, " +
+                    "so that the document isn't private");
+        }
+
+        if (++count == 2) {
+          this.destroy();
+          close();
+          done();
+        }
+      }
+    });
+  }).then(null, assert.fail);
+};
+
+exports["test page-mod on non-private tab"] = function (assert, done) {
+  let id = Date.now().toString(36);
+  let url = "data:text/html;charset=utf-8," + encodeURIComponent(id);
+
+  openWebpage(url, false).then(function(close){
+    PageMod({
+      include: url,
+      onAttach: function(worker) {
+        assert.equal(worker.tab.url, url,
+                     "Got a worker attached to the private window tab");
+        assert.ok(!isPrivate(worker), "The worker is really non-private");
+        assert.ok(!isPrivate(worker.tab), "The document is really non-private");
+
+        this.destroy();
+        close();
+        done();
+      }
+    });
+  }).then(null, assert.fail);
+}