    @Test
    public void testGetValues() {

        Object[] values = getTree().getValues();
        Arrays.sort(values);
        String valueString = Arrays.asList(values).toString();
        assertEquals("Sorted values should be [Bar, Baz, Bing, Bong, Foo]", "[Bar, Baz, Bing, Bong, Foo]", valueString);
    }