> For the complete documentation index, see [llms.txt](https://developer.thunderbird.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.thunderbird.net/thunderbird-development/testing.md).

# Testing

- [Running Tests](https://developer.thunderbird.net/thunderbird-development/testing/running-tests.md): How to run Thunderbird's automated tests.
- [Adding Tests](https://developer.thunderbird.net/thunderbird-development/testing/adding-tests.md): How to add your own tests for Thunderbird.
- [Writing Mochitest Tests](https://developer.thunderbird.net/thunderbird-development/testing/writing-mochitest-tests.md): Tips on writing Mochitest tests for Thunderbird.