Macros (block and inline) don't work in the vitest/bun test environment

[jsimonrichard]

I was trying to set up some tests for a macro extension I'm working on using bun:test but they refuse to work.

When executing in a normal environment (using bun run index.ts) the extension works as expected, but when I run my tests (with bun test), the processor acts as if the extension was never registered (even though it's included when I call registry.getInlineMacros()). I tried it with vitest as well, with the same result.

I have set up a minimal reproducible example here: https://github.com/jsimonrichard/asciidoctor.js-macro-test-issue-mre

I'm not sure if this is a bug with the test runners, my setup, or asciidoctor.js. Do you have any idea whats changing between the two environments (normal and testing)?