diff -r 000000000000 -r 6474c204b198 browser/metro/base/tests/mochitest/browser_mouse_events.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/metro/base/tests/mochitest/browser_mouse_events.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// from MouseEvents.h
+const leftButtonFlag = 1;
+const rightButtonFlag = 2;
+
+gTests.push({
+  desc: "Test native mouse events",
+  run: function () {
+    let tab = yield addTab("about:mozilla");
+
+    // Mousemove.
+    let waitForMove = waitForEvent(document, "mousemove");
+    synthesizeNativeMouseMove(tab.browser, 1, 1);
+    synthesizeNativeMouseMove(tab.browser, 100, 100);
+    let mousemove = yield waitForMove;
+    is(mousemove.cancelable, false, "mousemove is not cancelable");
+    is(mousemove.buttons, 0, "no buttons are down");
+
+    // Left button down.
+    let waitForDown1 = waitForEvent(document, "mousedown");
+    synthesizeNativeMouseLDown(tab.browser, 100, 100);
+    let mousedown1 = yield waitForDown1;
+    is(mousedown1.cancelable, true, "mousedown is cancelable");
+    is(mousedown1.buttons, leftButtonFlag, "left button is down");
+
+    // Right button down.
+    let waitForDown2 = waitForEvent(document, "mousedown");
+    synthesizeNativeMouseRDown(tab.browser, 100, 100);
+    let mousedown2 = yield waitForDown2;
+    is(mousedown2.buttons, leftButtonFlag | rightButtonFlag, "both buttons are down");
+
+    // Left button up.
+    let waitForUp1 = waitForEvent(document, "mouseup");
+    synthesizeNativeMouseLUp(tab.browser, 100, 100);
+    let mouseup1 = yield waitForUp1;
+    is(mouseup1.buttons, rightButtonFlag, "right button is down");
+
+    // Right button up.
+    let waitForUp2 = waitForEvent(document, "mouseup");
+    synthesizeNativeMouseRUp(tab.browser, 100, 100);
+    let mouseup2 = yield waitForUp2;
+    is(mouseup2.buttons, 0, "no buttons are down");
+
+    Browser.closeTab(tab, { forceClose: true });
+  }
+});
+
+let test = runTests;