Don't include tests in distribution

[mason3k]

Currently, the tests are included in src so they are packaged in the distribution and installed by consumers. The tests do not need to be distributed, and doing so can cause subtle side effects like namespace conflicts with local tests when this is installed as a 3rd party dependency.

Ultimately, since tests are not intended to be importable by consumers of the package, I would not think they should be in src:

• source

See also:

- [source](https://packaging.python.org/en/latest/discussions/package-formats/#what-is-a-wheel)