Set skip_missing_interpreters = true for tox - #58
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* Include XBlock in test.txt. * Remove unused, update outdated test dependencies.
In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them. Override this changed default by setting skip_missing_interpreters = true, so that tox runs with whatever Python is available. References: https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966
fghaas
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Great you got this sorted, thanks! Looks good to me.
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In tox 4.56, released on 2026-06-23, tox restored the 3.x behaviour (which it considers "correct") to fail on unavailable Python interpreters, rather than skipping them.
Override this changed default by setting
skip_missing_interpreters = true, so that tox runs with whatever Python is available.
References:
https://tox.wiki/en/latest/changelog.html#v4-56-0-2026-06-23 tox-dev/tox#3966