@Test public void testKeyCodeMapping() { final int[] keyCode = { -1 }; box.addKeyDownHandler(new KeyDownHandler() { public void onKeyDown(KeyDownEvent event) { keyCode[0] = event.getNativeKeyCode(); } }); box.press("a"); assertThat(keyCode[0], is(65)); box.press("B"); assertThat(keyCode[0], is(66)); }