check_latex_lang: Check if language can be compiled
In maxheld83/pensieveR: Tools for the Scientific Study of Operant Subjectivity

Checks if pandoc language can be compiled given local tex distribution.

check_latex_lang(x)

expect_latex_lang(x, info = NULL, label = vname(x))

test_latex_lang(x)

assert_latex_lang(x, .var.name = checkmate::vname(x), add = NULL)

`x`	`[character(1)` giving a pandoc language, same as `lang` in `md2tex()`.
`.var.name`	[`character(1)`] Name of the checked object to print in assertions. Defaults to the heuristic implemented in `vname`.
`add`	[`AssertCollection`] Collection to store assertion messages. See `AssertCollection`.

Depending on the function prefix: If the check is successful, the functions assertVector/assert_vector return x invisibly, whereas checkVector/check_vector and testVector/test_vector return TRUE. If the check is not successful, assertVector/assert_vector throws an error message, testVector/test_vector returns FALSE, and checkVector returns a string with the error message. The function expect_vector always returns an expectation.