This folder contains a V project, intended to be used as a demonstration for how to test functions defined inside a main module. See my_test.v and my_other_test.v . These files work as any other internal module tests, i.e. they do `module main` at their top, so that v knows, that they are internal tests, and for which module they apply. When you do `v my_test.v`, v will try to find other *.v files in the same folder that also have `module main` at their top, then it will process them and process the my_test.v file too. The v `fn main(){}` function that you most likely also have will get compiled as normal to `void main__main(){...}`, but it will NOT be called by anything, so it will not mess up your tests. Instead, your test_ functions will get called inside the generated `int main(){...}` test runner, just like it is the case with all _test.v files (internal or external ones). > **Note** > Each _test.v file is compiled separately from all other _test.v > files, so you can have conflicting test_ functions in them without a > problem too.