1 files changed, 45 insertions, 0 deletions
diff --git a/addon-sdk/source/test/test-tab-observer.js b/addon-sdk/source/test/test-tab-observer.js
new file mode 100644
index 000000000..49f0e3957
--- /dev/null
+++ b/addon-sdk/source/test/test-tab-observer.js
@@ -0,0 +1,45 @@
+/* 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";
+
+// TODO Fennec support in Bug #894525
+module.metadata = {
+  "engines": {
+    "Firefox": "*"
+  }
+}
+
+const { openTab, closeTab } = require("sdk/tabs/utils");
+const { Loader } = require("sdk/test/loader");
+const { setTimeout } = require("sdk/timers");
+
+exports["test unload tab observer"] = function(assert, done) {
+  let loader = Loader(module);
+
+  let window = loader.require("sdk/deprecated/window-utils").activeBrowserWindow;
+  let observer = loader.require("sdk/tabs/observer").observer;
+  let opened = 0;
+  let closed = 0;
+
+  observer.on("open", function onOpen(window) { opened++; });
+  observer.on("close", function onClose(window) { closed++; });
+
+  // Open and close tab to trigger observers.
+  closeTab(openTab(window, "data:text/html;charset=utf-8,tab-1"));
+
+  // Unload the module so that all listeners set by observer are removed.
+  loader.unload();
+
+  // Open and close tab once again.
+  closeTab(openTab(window, "data:text/html;charset=utf-8,tab-2"));
+
+  // Enqueuing asserts to make sure that assertion is not performed early.
+  setTimeout(function () {
+    assert.equal(1, opened, "observer open was called before unload only");
+    assert.equal(1, closed, "observer close was called before unload only");
+    done();
+  }, 0);
+};
+
+require("sdk/test").run(exports);