### Bug description

As far as I can tell, there are no tests of rendering `.qmd` files with Julia code.  E.g.
```bash
paul@pts2 tests  [main] $ grep -rnw . -e "{julia}" | wc -l
0
paul@pts2 tests  [main] $ grep -rnw . -e "{python}" | wc -l
15
paul@pts2 tests  [main] $ grep -rnw . -e "{r}" | wc -l
130
```


### Checklist

- [ ] Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [ ] Please [format your issue](https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us) so it is easier for us to read the bug report.
- [ ] Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [ ] Please document the operating system you're running. If on Linux, please provide the specific distribution.
2023-01-13T20:25:33Z
schrimpf
enhancement
Future
open
there are no tests for Julia
https://github.com/quarto-dev/quarto-cli/issues/3965