texmath-0.12.5: test/writer/mml/labels.test

<<< native
[ ENumber "2" , ESymbol Bin "+" , ENumber "2" ]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mn>2</mn>
    <mo>+</mo>
    <mn>2</mn>
  </mrow>
</math>