The test directory is shipped with the plugin and "installed" as an individual package #291

Hello,

I just noticed that the test directory of the project is shipped with the plugin and is showing up as if it was an independent test package installed from PyPI:

Since it is supposed to be shipped as an "extra" and I didn't install the plugin with any extras, I guess there is something wrong with this line in the pyproject.toml? (like, no s would be correct, I guess)

[tool.setuptools]
packages = { find = { exclude = ["*.tests"] } }

Cheers