@Test
public void test_compareTo() {

    byte[] b1 = new byte[] {5, 6, 7};
    byte[] b2 = new byte[] {1, 2, 3, 4, 5, 6 ,7, 8, 9};
     assertThat(compareTo(b1, 0, b1.length, b2, 4, b1.length), is(0));
}