ferenc-csaky opened a new pull request, #23211:
URL: https://github.com/apache/flink/pull/23211
## What is the purpose of the change
Migrates JUnit4 unit tests in `org.apache.flink.runtime.accumulators` and
`org.apache.flink.runtime.blob` packages to JUnit5.
## Brief change log
- Made test methods and classes package-private.
- Added `TestLoggerExtension` instead of extending JUnit4 `TestLogger`
class.
- Migrated to `@TempDir` from the temp. folder class rule that does not
exist in JUnit5.
- Added `BlobServer` and `BlobCache` instantiation utils to
`TestingBlobUtils` to cut back code duplication.
- Moved some blob test helper utils that were used by the `HDFSTest` class
from `flink-fs-tests` to a new public class `TestingBlobHelpers`, so all unit
test classes can be package-private.
- Applied AssertJ for all assertion and assumption statements.
## Verifying this change
Any touched unit test should still run and verify the same thing as before.
## 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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