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https://issues.apache.org/jira/browse/FLINK-39853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Purushottam Sinha updated FLINK-39853:
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Summary: [JUnit5 Migration] Upgrade Testcontainers to 2.0.5 -
flink-autoscaler-plugin-jdbc (was: Upgrade Testcontainers to 2.0.5 and remove
the JUnit 4 dependency from flink-autoscaler-plugin-jdbc)
> [JUnit5 Migration] Upgrade Testcontainers to 2.0.5 -
> flink-autoscaler-plugin-jdbc
> ---------------------------------------------------------------------------------
>
> Key: FLINK-39853
> URL: https://issues.apache.org/jira/browse/FLINK-39853
> Project: Flink
> Issue Type: Sub-task
> Components: Kubernetes Operator
> Reporter: Purushottam Sinha
> Priority: Minor
>
> After the JUnit 5 migration, flink-autoscaler-plugin-jdbc still carried JUnit
> 4 on its test classpath. This was unavoidable on Testcontainers 1.x:
> GenericContainer implemented org.junit.rules.TestRule, so JUnit 4 was
> required at compile time, and the module pinned the old Testcontainers 1.18.2
> plus an explicit junit:junit dependency purely to satisfy that coupling.
> Testcontainers 2.0.0 (2025-10-14) removed JUnit 4 support —
> testcontainers-core no longer references JUnit 4 and GenericContainer no
> longer implements TestRule. Upgrading lets us remove JUnit 4 entirely.
> Changes:
> - Bump testcontainers.version 1.18.2 → 2.0.5 (via the testcontainers-bom
> import).
> - Remove the explicit junit:junit test dependency (only needed for
> Testcontainers 1.x).
> - Handle Testcontainers 2.0 breaking changes:
> ** Renamed module artifacts: org.testcontainers:postgresql →
> testcontainers-postgresql, org.testcontainers:mysql → testcontainers-mysql.
> ** Relocated container classes:
> org.testcontainers.containers.{MySQL,PostgreSQL}Container →
> org.testcontainers.{mysql,postgresql}.*, which are no longer self-typed
> generics (drop the <> on field types and construction).
> - Keep the junit-vintage-engine exclusion on flink-test-utils-junit (Flink's
> test utils still pull it in transitively), plus a junit:junit exclusion as a
> guard so JUnit 4 cannot silently return.
> Verification:
> - Dependency tree shows no junit:junit and no junit-vintage-engine.
> - flink-autoscaler-plugin-jdbc builds and all container integration tests
> pass against Testcontainers 2.0.5: MySQL 5.6 / 5.7 / 8.0, PostgreSQL 15,
> Derby (113 tests, 0 failures).
>
> Acceptance criteria:
> - Module builds and tests pass with no junit:junit / org.junit.vintage on
> the dependency tree
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