How to drop static variable at the end of all tests?

Hi all,

I am trying to run a docker container using testcontainers-rs at the beginning of the tests using static variable so I can have single container shared by all tests.

// std::sync::OnceLock from rust 1.70 
static CONTAINER: OnceLock<Container<IMAGE>> = OnceLock::new();

fn container() -> &'static Container<IMAGE> {

// more code ...

There are more code but those are irrelevant at the moment. This code works fine, I have one container for the all the tests and containers is not even started when none of the tests is touching it so it's also lazy as far as I can tell which is great. However, I have a small problem with restriction of the statics variables;

 Static items do not call drop at the end of the program.

testcontainers-rs actually implements Drop which removes the containers when it goes out of scope, but due to the above restrictions containers stay around after the tests. I would like to be able to add some sort of afterAll or shutdownHook behavior to tests but I can't seem to find anything.

Thanks in advance!

NOTE: Please consider this as a learning because I know that there are already some libraries like sqlx with sqlx:test macro which creates database (as in database inside given database instance) and allow you to use dedicated database for each tests. However I am using Diesel (again for the sake of learning) which doesn't have such support.

What you want here is atexit. You can read about how it works here.

Note that if something would end up badly wrong handler may not be called (e.g. there are _exit function which bypasses hooks).

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