	@Test
	public void internStringReturnUniqueStrings() {

		String a = "abcdjjq";
		String b = a + "";
		String c = a + "";
		assertTrue(a.equals(b));
		assertTrue(b.equals(c));
		assertTrue(a.equals(c));
		assertFalse(a == b);
		assertFalse(b == c);
		assertFalse(a == c);
		assertTrue(a == unique(a));
		assertTrue(a == unique(b));
		assertTrue(a == unique(c));
	}