diff -r 000000000000 -r 6474c204b198 mobile/android/base/tests/testUITelemetry.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/tests/testUITelemetry.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,87 @@
+// -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
+/* 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/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+const TEST_PREFIX = "TEST-";
+const TEST_REGEX = new RegExp("^" + TEST_PREFIX);
+
+function do_check_array_eq(a1, a2) {
+  do_check_eq(a1.length, a2.length);
+  for (let i = 0; i < a1.length; ++i) {
+    do_check_eq(a1[i], a2[i]);
+  }
+}
+
+function getObserver() {
+  let bridge = Cc["@mozilla.org/android/bridge;1"]
+                 .getService(Ci.nsIAndroidBridge);
+  let obsXPCOM = bridge.browserApp.getUITelemetryObserver();
+  do_check_true(!!obsXPCOM);
+  return obsXPCOM.wrappedJSObject;
+}
+
+/**
+ * The following event test will fail if telemetry isn't enabled. The Java-side
+ * part of this test should have turned it on; fail if it didn't work.
+ */
+add_test(function test_enabled() {
+  let obs = getObserver();
+  do_check_true(!!obs);
+  do_check_true(obs.enabled);
+  run_next_test();
+});
+
+add_test(function test_telemetry_events() {
+  let obs = getObserver();
+  let measurements = obs.getUIMeasurements().filter(function(m) {
+    // Only want events and sessions that were generated by
+    // the Java-side of the test.
+    return TEST_REGEX.test(m.type == "event" ? m.action : m.name);
+  });
+
+  let expected = [
+    ["event",   TEST_PREFIX + "enone",   "method0", [], null],
+    ["event",   TEST_PREFIX + "efoo",    "method1", [TEST_PREFIX + "foo"], null],
+    ["event",   TEST_PREFIX + "efoo",    "method2", [TEST_PREFIX + "foo"], null],
+    ["event",   TEST_PREFIX + "efoobar", "method3", [TEST_PREFIX + "foo", TEST_PREFIX + "bar"], "foobarextras"],
+    ["session", TEST_PREFIX + "foo",     "reasonfoo"],
+    ["event",   TEST_PREFIX + "ebar",    "method4", [TEST_PREFIX + "bar"], "barextras"],
+    ["session", TEST_PREFIX + "bar",     "reasonbar"],
+    ["event",   TEST_PREFIX + "enone",   "method5", [], null],
+  ];
+
+  do_check_eq(expected.length, measurements.length);
+
+  for (let i = 0; i < measurements.length; ++i) {
+    let m = measurements[i];
+
+    let type = m.type;
+    if (type == "event") {
+      let [type, action, method, sessions, extras] = expected[i];
+      do_check_eq(m.action, action);
+      do_check_eq(m.method, method);
+      // might receive real sessions in addition to the test ones -- remove the real ones
+      do_check_array_eq(m.sessions.filter(s => TEST_REGEX.test(s)), sessions);
+      do_check_eq(m.extras, extras);
+      continue;
+    }
+
+    if (type == "session") {
+      let [type, name, reason] = expected[i];
+      do_check_eq(m.name, name);
+      do_check_eq(m.reason, reason);
+      continue;
+    }
+  }
+
+  run_next_test();
+});
+
+run_next_test();