List ptgs = ((FormulaRecord)mockListen._frecs.get(0)).getParsedExpression();
assertEquals(1, ptgs.size());
assertTrue(ptgs.get(0) instanceof Ref3DPtg);
Ref3DPtg ptg = (Ref3DPtg)ptgs.get(0);
assertEquals("Sheet1!A1", ptg.toFormulaString(stubHSSF));
// Now check we get the right formula back for
// a few sample ones