Parallel suites/tests execution

[SheliakLyr]

Scalatest can run suites and individual tests in multiple threads.

Is it possible to achieve that using this integration?

[cheeseng]

@SheliakLyr Sorry for replying late, for some reason I just notice this message. If you are referring to the JUnit5 test engine implementation, then I think there's more a question for JUnit 5 runner, e.g. you may try https://www.baeldung.com/junit-5-parallel-tests . Afaik JUnit5 runner will call into ScalaTestEngine to execute JUnit5 platform, and JUnit5 runner may do that in parallal manner.

I'll investigate if ParallelTestExecution will work correct with this integration.

[cheeseng]

Ok seeing from this line here:

https://github.com/scalatest/scalatestplus-junit5/blob/main/src/main/scala/org/scalatestplus/junit5/ScalaTestEngine.scala#L282

None is being passed as distributor, so the tests in ParallelTestExecution won't be run in parallel, I'll try to see if I can make it to pass in a distributor to support parallel execution.

[cheeseng]

@SheliakLyr Fyi I submitted the following PR to support ParallelTestExecution:

#18

[SheliakLyr]

Hi @cheeseng

Sorry for the late reply, I am still very interested about this topic.

Running test cases in a single suite concurrently would be great, but I currently cannot event run separate suites in parallel. I have tried the link you provided, but tests still run in a single-threaded mode. For completeness, I did check your PR, but nothing changes.

I suspect, that your assumption about junit runner is false:

JUnit5 runner may do that in parallal manner

I think that the article you linked refers to a different TestEngine (JupiterTestEngine), which does, in fact, support parallel execution. The property junit.jupiter.execution.parallel.enabled is defined in interface org.junit.jupiter.engine.config.JupiterConfiguration.

My reasearch suggests, that TestEngine implementations are responsible for the parallelization of the executed suites.

A kind-of related issue: junit-team/junit5#2229