> For the complete documentation index, see [llms.txt](https://udemy.gitbook.io/coding-exercises/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://udemy.gitbook.io/coding-exercises/master.md).

# Introduction

Providing tests for solutions to your exercises enables students to instantly receive helpful messages. This feedback is essential in helping students identify their mistakes and providing important validation when they succeed.

The quality of your tests and the messages they provide contribute directly to the quality of the experience your students receive.