This is a minimal example of showing usage of lit out of the llvm-project.

The codes should tell themself, you can read the comment in the files to understand how to do it.

Here is a recommended reading order:

1. CMakeLists.txt: Tells you how to integrate lit into cmake
2. lit.site.cfg: Tells you how to bridge cmake and lit
3. lit.cfg: Tells you how to setup a common config
4. tests/ and srcs/: Tell you how to use lit.local.cfg and how to add new tests

If you can read chinese (or you may use chrome translation), my post lit and filecheck may help you too.