@Test
public void testGetY() {

	list1.addValue(-1L, 10F);
	list1.addValue(-2L, -3F);
	list1.addValue(30L, 3F);
	list1.addValue(2L, -100F);
	list1.addValue(31L, -100F);
	/* expected = [ 10, 3, -100] */
	assertEquals(10L, list1.getY(0).longValue());
	assertEquals(3L, list1.getY(1).longValue());
	assertEquals(-100L, list1.getY(2).longValue());
}