Use python -m build
to create wheels for tox and only do it once per tox invocation
#231
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Previously: when running tox, it created wheels directly from the source tree and installed
Now: When running tox, always run against a wheel which is created from sdist created from the source tree (using python -m build). This way (1) also the sdist is tested and (2) the same exact wheel files which are uploaded to PyPI will be tested in the unit tests.
In addition, start using the .pkg_external tox environment for building the wheel -- with a small adjustment: Always only build the wheel once (makes the tests run faster).