	@Test
	public void testTupleHashcode() {

		Tuple<String, String> t1 = new Tuple<String, String>("S1", "S2");
		Tuple<String, String> t2 = new Tuple<String, String>("S1", "S2");
		assertEquals(t1.hashCode(), t2.hashCode());

		Tuple<String, String> t3 = new Tuple<String, String>(null, null);
		t3.hashCode();
	}