asciidoctor-doctest invoked from the javascript toolchain

[obilodeau]

doctest is really useful to track regressions anywhere in the asciidoc stack (us, upstream or dependencies). However, right now they are only invoked from the ruby code and thus problems introduced by other components (like Opal) can't be detected by it currently.

asciidoctor-doctest is working on allowing its test suite to be run from the command-line, allowing any interpreter. We would then integrate that into our Travis automated testing.

Ref: asciidoctor/asciidoctor-doctest#13

[ggrossetie]

I've opened a pull request to make the processor configurable in asciidoctor-doctest but unfortunately it doesn't work yet.

Could you take a look ?

asciidoctor/asciidoctor-doctest#16

Once this is fixed we could implement a custom processor to use Asciidoctor.js CLI in asciidoctor-doctest 🎉