mateczagany opened a new pull request, #27669:
URL: https://github.com/apache/flink/pull/27669
## What is the purpose of the change
Migrate some of the tests in module flink-tests from JUnit4 to JUnit5.
## Brief change log
- Migrate all test cases to use JUnit5.
- Update all assertions to `assertThat()`
- Limit scope for test classes where possible
- Restrict visibility of fields where possible
- Remove `@SuppressWarnings` where it was unnecessary
## Verifying this change
- I ran each updated tests one by one after migrating them
- CI should pass
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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