assertEquals(false, t4.isTabStop(0));
assertEquals(false, t4.isTabStop(1));
assertEquals(false, t4.isTabStop(2));
assertEquals(true, t4.isTabStop(3));
assertEquals(false, t4.isTabStop(4));
assertEquals(false, t4.isTabStop(5));
assertEquals(false, t4.isTabStop(6));
assertEquals(true, t4.isTabStop(7));
assertEquals(false, t4.isTabStop(8));