	@Test
	public void testAnd() {

		assertEquals(10, Ops.and(null, 1, 10));
		assertEquals(1, Ops.and(null, 10, 1));
		assertEquals(10, Ops.and(null, 10, 10));

		assertEquals(null, Ops.and(null, null, 10));
		assertEquals(0, Ops.and(null, 0, 10));
		assertEquals(null, Ops.and(null, 10, null));
		assertEquals(0, Ops.and(null, 10, 0));
	}