assertTrue("one of the breaks didnt make it", is0 && is1 && is10 && is15);
sheet.removeColumnBreak(15);
assertFalse("column break should not be there", sheet.isColumnBroken(15));
sheet.removeColumnBreak(0);
assertFalse("column break should not be there", sheet.isColumnBroken(0));
sheet.removeColumnBreak(1);
assertFalse("column break should not be there", sheet.isColumnBroken(1));