Couldn't store data for global purposes while parallel running

[NazarYermolenko]

Description

Case: I need to collect custom data from tests while parallel running and then I need to use that.
The way I did, I tried to store and collect data in the static object but while parallel running it creates a new static object for each worker anyway, I've tried to use setup, teardown methods, global setup/teardown methods, but still couldn't resolve the issue.

Steps to Reproduce

Create a few tests async tests (10 parallel tests) for 4 workers, and try to collect generated random numbers in each test to global object or file.

Expect:
The global tear-down setup methods can access in-memory values.
Or to have a container for data between workers

Actual:
Global teardown/setup methods don't have access to in-memory (test) values.
It's impossible to share or collect data between workers

[malammar]

As the workers are separate child processes there's no easy way to send data back to the main process. My recommendation is to have each worker/test write to a temporary file and then read that file at the end of the tests.