msqrt5.test

<<< native
[ ESqrt (EGrouped [ ESymbol Bin "-" , ENumber "1" ]) ]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <msqrt>
    <mrow>
      <mo>-</mo>
      <mn>1</mn>
    </mrow>
  </msqrt>
</math>