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[FLINK-39527][test] Migrate flink-end-to-end-tests to JUnit 5#28040

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[FLINK-39527][test] Migrate flink-end-to-end-tests to JUnit 5#28040
mateczagany wants to merge 1 commit intoapache:masterfrom
mateczagany:FLINK-39527

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@mateczagany
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What is the purpose of the change

Update flink-end-to-end-tests module to use only JUnit 5 instead of JUnit 4

Brief change log

  • Migrated assertions to use AssertJ
  • Limited visibility of classes/methods/fields where I could
  • Upgraded Prometheus E2E test to use newer release, to make it work on ARM-based MacOS
  • Replaced JUnit 4 runners with JUnit 5 extensions, such as FlinkResourceExtension and DownloadCacheExtension

Verifying this change

  • The PR should pass all CI checks

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

Was generative AI tooling used to co-author this PR?
  • Yes (please specify the tool below)

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flinkbot commented Apr 27, 2026

CI report:

Bot commands The @flinkbot bot supports the following commands:
  • @flinkbot run azure re-run the last Azure build

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@RocMarshal RocMarshal left a comment

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Thank you @mateczagany for your contribution.
LGTM +1 on the whole, just a few of comments.
PTAL~

Comment on lines +34 to +40
void before() throws Exception;

void afterTestSuccess();

default void afterTestFailure() {
afterTestSuccess();
}
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Could you help add some comment lines to describe the methods definetion ?

Comment on lines +34 to +40
void before() throws Exception;

void afterTestSuccess();

default void afterTestFailure() {
afterTestSuccess();
}
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ditto.


@Rule public final DownloadCache downloadCache = DownloadCache.get();
@RegisterExtension
private final DownloadCacheExtension downloadCache =
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I suggest the variable name is downloadCacheExtension. Leaving as downloadCache is confusing.
Also if we are now using the Extension, can we make DownloadCache private to the DownloadCacheExtension, so no-one can use it apart from via the extension?

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4 participants