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

<<< native
[ EIdentifier "Y"
, EOver False (ESymbol Op "\8592") (EIdentifier "f")
, EIdentifier "X"
, EOver False (ESymbol Op "\8594") (EIdentifier "g")
, EIdentifier "Z"
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mi>Y</mi>
    <mover>
      <mo>←</mo>
      <mi>f</mi>
    </mover>
    <mi>X</mi>
    <mover>
      <mo>→</mo>
      <mi>g</mi>
    </mover>
    <mi>Z</mi>
  </mrow>
</math>