GuidedDTDRLPersistence { boolean validateAttributeCell(String c) { return (c != null) && (!c.trim().equals("")); }  static GuidedDTDRLPersistence getInstance(); String marshal(final GuidedDecisionTable52 originalDTable);  }
@Test public void testAttributeCellValue() { GuidedDTDRLPersistence p = new GuidedDTDRLPersistence(); assertFalse(p.validateAttributeCell(null)); assertFalse(p.validateAttributeCell("")); assertFalse(p.validateAttributeCell(" ")); }