How is code syntax highlighting enabled?

[Moult]

One day, I ran some pytests and found that failing test code had syntax highlighting. This is awesome! However, on the same machine, in the same repo, later, running the tests again I no longer see syntax highlighting. What could I be missing? How do I ensure that code highlighting is enabled?

Things I have tried:

• I have addopts = --color=yes --code-highlight=yes (I have checked, and --color=no disables colour as expected, but --code-highlight=yes seems to have no impact)
• I have tested out pygmentize foo.py and I see colours
• I have pip installed pygments
• I have tried different variations of theme and theme mode such as: env PYTEST_THEME=emacs PYTEST_THEME_MODE=dark pytest test/tool/test_material.py
• pytest is version 7.1.2

Ideas? :)

[Moult]

Ah, pebkac :)

I forgot an addon called pytest-blender actually uses a different Python env and that one didn't have pygments... so I was debugging the wrong environment! All solved now after installing pygments