texmath-0.12.9: test/writer/mml/mi4.test

<<< native
[ EIdentifier "f"
, ESymbol Ord "\8289"
, EDelimited "(" ")" [ Right (EIdentifier "x") ]
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mi>f</mi>
    <mo>&#8289;</mo>
    <mrow>
      <mo stretchy="true" form="prefix">(</mo>
      <mi>x</mi>
      <mo stretchy="true" form="postfix">)</mo>
    </mrow>
  </mrow>
</math>