I developed a fairly long build script. Now I need to add a set of unit tests to build.rs file. I tried to do the same as I do for regular files:

// build.rs

#[cfg(test)]
mod tests {

    #[test]
    fn test1() {
        //...
    }
}

but seems it didn’t work. Running tests doesn’t result in running test1.

>Solution :

This is issue #1581, that was closed as "needs an RFC". So this is not possible currently. The workaround, as @MeetTitan said, is to extract the build script logic into its own crate and make it a build-dependency and call it from the build script.