I want to set up once, and run many e2e tests in parallel against multiple copies of pg-mem

[andrecarlucci]

The idea is:

1. create the DB: db = newDb();
2. set up my schema using typeorm. (db.adapters.createTypeormDataSource()... syncrhonize()
3. create a db backup. db.backup();
4. put this all in a static class
5. for each test requiring a DataSource, I would call a method from this static class creating a new DataSource pointing to the snapshot version of the database.

The problem is, db.backup() doesn't produce a new version of the database, it creates a snapshot point I have no access to.

I need something like:

var copyOfDb = db.backup();
newDataSource = await copyOfDb.adapters.createTypeormDataSource({...})

Any other way to achieve this?

[andrecarlucci]

Hmm... I guess this is not possible, right?
If I got it right, Jest will run tests of different files in parallel each in its own process not sharing state between them.
This means my static context won't be shared and the best I will get is one instance of the DB per file anyway.
Would that be a correct assumption?