[FLINK-25538] Migrate tests from JUnit 4 to JUnit 5 #215
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Migrates tests from JUnit 4 to JUnit 5 [FLINK-25538]. Split into 3 commits for easier review:
Commits
1. Migrate tests from JUnit 4 to JUnit 5
Main migration JUnit 4 -> JUnit 5. Compiles and tests pass.
2. Replace
@ExtendWith(TestLoggerExtension)with global SPI registrationUses SPI registration instead of
@ExtendWithon every class (feedback from #106)3. Remove optional public modifiers following JUnit 5 best practices
JUnit 5 doesn't require test classes/methods to be
public. Removed these modifiers from migrated files to match modern conventions (also what Sonar/other linters recommend). Files not migrated in this PR still keep theirpublicmodifiers.