assertEquals(0, a.size());
a.add(5.2f).add(6f).add(5.9f).add(4.1f);
assertEquals(4, a.size());
a.sort();
assertEquals(4, a.size());
assertTrue(Math.abs(a.get(0)-4.1) < 0.0001);
assertTrue(Math.abs(a.get(1)-5.2) < 0.0001);
assertTrue(Math.abs(a.get(2)-5.9) < 0.0001);