Kafka 16801 FIx Streams upgrade :test target doesn't find any junit tests

[abhi-ksolves]

As per the discussion, the approach 4 movement from the test directories to main is implemented.

Ticket Link :- https://issues.apache.org/jira/browse/KAFKA-16801

[github-actions]

A label of 'needs-attention' was automatically added to this PR in order to raise the
attention of the committers. Once this issue has been triaged, the triage label
should be removed to prevent this automation from happening again.

[mjsax]

Can we maybe do this cleanup in a separate PR?

[mjsax]

Seems we need to change the package name, to avoid conflicts with the "main" StreamsUpgradeTest.java ?

Could this cause issue when running the corresponding upgrade system test? We hardcode the same name across all version (including trunk) https://github.com/apache/kafka/blob/trunk/tests/kafkatest/services/streams.py#L601

This will all be quite tricky to clean up, as older jar we currently load, will provide the old name...

[mjsax]

Seems this issue is getting resolved via 6295c8a

Should we close this PR, or wait until#19513 got merged?

[chia7712]

chia7712@fedora:~/project/kafka$ ./gradlew cleanTest streams:upgrade-system-tests-37:test

> Configure project :
Starting build with version 4.2.0-SNAPSHOT (commit id c6bbbbe2) using Gradle 9.1.0, Java 21 and Scala 2.13.16
Build properties: ignoreFailures=false, maxParallelForks=24, maxScalacThreads=8, maxTestRetries=0

[Incubating] Problems report is available at: file:///home/chia7712/project/kafka/build/reports/problems/problems-report.html

Deprecated Gradle features were used in this build, making it incompatible with Gradle 10.

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.

For more on this, please refer to https://docs.gradle.org/9.1.0/userguide/command_line_interface.html#sec:command_line_warnings in the Gradle documentation.

BUILD SUCCESSFUL in 10s
71 actionable tasks: 6 executed, 65 up-to-date
Consider enabling configuration cache to speed up this build: https://docs.gradle.org/9.1.0/userguide/configuration_cache_enabling.html

streams:upgrade-system-tests-37:test works well after merging #19513, so I'm going to close this PR. Please feel free to reopen it if I misunderstand anything.