Add unit tests to example projects

Start testing example projects by adding Pytest tests to the Python code
itself.

Author: jrrickerson

examples/pure-hatch/pyproject.toml

@@ -47,3 +47,6 @@ select = [
 
 [tool.ruff.isort]
 known-first-party = ["examplePy"]
+
+[tool.pytest.ini_options]
+pythonpath = "src"