Add test duration information to output, similar `tox`

[chirizxc]

How would this feature be useful?

This feature would be useful for tracking test execution time. It would help developers identify performance regressions and optimize their workflows.

Describe the solution you'd like

for example:

nox > Session fastapi_latest was successful (12.34 seconds).
nox > Ran multiple sessions:
nox > * fastapi_0096: success (9.34 seconds)
nox > * fastapi_0109: success (2.12 seconds)
nox > * fastapi_latest: success (0.88 seconds)

or

nox > Session fastapi_latest was successful.
nox > Ran multiple sessions:
nox > * fastapi_0096: success (9.34 seconds)
nox > * fastapi_0109: success (2.12 seconds)
nox > * fastapi_latest: success (0.88 seconds)
nox > Total 12.34 seconds

Describe alternatives you've considered

No response

Anything else?

No response

[DiddiLeija]

I think this could be a useful feature! But IMO I'd like it to be optional and not the default. Maybe having a --timer flag or something would work, to ask Nox to report test duration?

[namurphy]

This sounds useful! I'm reminded of pytest --durations n which lists the tests with the n longest durations. Using --durations as the flag would help for consistency with pytest (with n being optional). I don't see an equivalent flag in tox. 🤔

[chirizxc]

This sounds useful! I'm reminded of pytest --durations n which lists the tests with the n longest durations. Using --durations as the flag would help for consistency with pytest (with n being optional). I don't see an equivalent flag in tox. 🤔

tox show duration by default

[DiddiLeija]

Yup, tox shows duration by default. But many Nox users don't mind at all about these details, so in order to keep our simplicity approach, I'd recommend having an optional flag for this (the suggested --duration sounds nice) :)

[henryiii]

I think it wouldn't be too bad if it was inline, since we already print out something at the end. Basically we could change this:

nox > Session tests-3.13 was successful.

to this:

nox > Session tests-3.13 was successful in 3 seconds.

without adding more flags. We could use https://pypi.org/project/humanize/, which is a simple library by some CPython developers that prints very readable times. We added this to cibuildwheel recently. We could also hide really short times (a moment in humanize), and only print this if interesting (say, a second or more?).