Unit tests that validate correctness across every SIMD backend and language binding against serial and STL baselines. Each C++ translation unit exercises one kernel family, and the Python suite mirrors it module-for-module.

• stringzilla.cpp — C++ API against STL baselines.
• stringzillas.cpp / stringzillas.cu — parallel CPU and CUDA backend tests.
• hash.cpp, find.cpp, sort.cpp, string.cpp, uncased.cpp, cipher.cpp — per-family kernel tests.
• utf8_runes.cpp, utf8_wordbreaks.cpp, utf8_graphemes.cpp, utf8_sentences.cpp, utf8_linebreaks.cpp, utf8_norm.cpp, utf8_tokens.cpp — UTF-8 decode and segmentation tests.
• stringzilla.hpp and utf8.hpp are the shared harnesses; fingerprints.cuh and similarities.cuh are the CUDA harnesses.

The Python modules mirror the C++ translation units one-for-one and run under pytest.

• find.py, hash.py, sort.py, string.py, uncased.py, cipher.py, utf8_*.py, doctests.py, stringzilla.py, stringzillas.py — per-family tests.
• helpers.py and utf8_helpers.py are shared helpers; conftest.py holds the pytest configuration.
• This directory is a Python package via __init__.py, so the prefix-less modules namespace as test.* and never shadow stdlib names.
• Run the suite with pytest test/.

• stringzilla.js — Node test runner, invoked with node --test.