texmath-0.12.5: test/writer/mml/ms-15.test

<<< native
[ EText TextNormal "\"string\8221"
, ESymbol Rel "="
, EText TextNormal "\8220string\""
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mtext mathvariant="normal">&quot;string”</mtext>
    <mo>=</mo>
    <mtext mathvariant="normal">“string&quot;</mtext>
  </mrow>
</math>