Non-flaky tests with asynchronous tasks

[Damtev]

Description

For now, tests for methods that create some tasks asynchronously, are potentially flaky - we do not know how much time is required to finish the task, so asserts in the tests could be executed before finishing the task and accordingly fail. Also, such tests could not be generated using concrete execution, for the same reasons.

We need to find a way to fix it somehow - perhaps just warn a user, or disable such tests by default with a reasoning message, or use some time limit.

Expected behavior

The most reasonable expected behavior should be investigated.

Environment

Check tests in org.utbot.examples.threads package.

Potential alternatives

Not investigated yet.

Context

No additional context.