Running pytest immediately after usethis tool pytest fails because the tests directory has no test files. This adds a tests/test_example.py with a trivial passing test so pytest works out of the box.

def test_add():
    """An example test - replace with your own tests!"""
    assert 1 + 1 == 2

Changes

• _integrations/pytest/core.py — Added add_example_test() to create the example file; updated remove_pytest_dir() to treat test_example.py as a managed file (auto-cleaned on removal)
• _core/tool.py — use_pytest() accepts example: bool = True and calls add_example_test() when enabled
• CLI layer — Added --example/--no-example option wired through usethis tool pytest and usethis test commands
• _toolset/test.py — Threaded example param through use_test_frameworks()
• Tests — Added TestAddExampleTest (content, message, idempotency), roundtrip/cleanup tests for remove_pytest_dir with example file, test_no_example at both core and CLI layers, plus test_conftest_already_exists for 100% module coverage
• README.md — Updated example output