sdist is missing tests

[mtelka]

Describe the bug

context
The sdist package at PyPI is missing tests.

expectation
The tests directory is included in sdist.

bug
The tests directory is missing (but tox.ini file is there).

problem
This is a problem for people packaging markdown-it-py for OpenIndiana (read: me) where we run tests to make sure the package is working as expected.

Reproduce the bug

Download sdist from PyPI and unpack it.

List your environment

No response

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