@Test public void allOf() throws Exception {

    IntSet one = IntSet.allOf(4, 2);
    assertFalse(one.contains(0));
    assertFalse(one.contains(1));
    assertTrue(one.contains(2));
    assertFalse(one.contains(3));
    assertTrue(one.contains(4));
    assertFalse(one.contains(5));
}