sample directory missing test folder

[n8behavior]

Nit-pick but hey, why not ;)

✋ A similar PR may already be submitted! Please search 🔎 among the open pull requests before creating one.

Updating the Game of Life tutorial's code? Also send a PR to rustwasm/wasm_game_of_life!

Now that you've checked, it's time to create your PR. 📝 Thanks for submitting! 🙏

For more information, see the contributing guide. 👫

Summary

Explain the motivation for making this change. What existing problem does the pull request solve? 🤔

Fixes #___