texmath-0.12.5: test/writer/tex/mrow-01.test

<<< native
[ EFraction NormalFrac (EIdentifier "x") (ENumber "4")
, ESymbol Rel "="
, EFraction NormalFrac (EIdentifier "x") (ENumber "4")
]
>>> tex
\frac{x}{4} = \frac{x}{4}