texmath-0.13.2: test/writer/starmath/055_vmatrix_environment.test
<<< tex
\begin{vmatrix}a&b\\c&d\end{vmatrix}
>>> starmath
left lline matrix { a # b ## c # d } right rline
<<< tex
\begin{vmatrix}a&b\\c&d\end{vmatrix}
>>> starmath
left lline matrix { a # b ## c # d } right rline