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https://issues.apache.org/jira/browse/LOG4J2-2653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16884482#comment-16884482
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Gary Gregory commented on LOG4J2-2653:
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I would ask that _no_ JUnit 4 helper classes like {{LoggerContextRule}} be
removed as I have tons of code depending on it. IOW, _add_ JUnit 5 helpers all
you want, just don't delete existing classes.
> Migrate to JUnit 5
> ------------------
>
> Key: LOG4J2-2653
> URL: https://issues.apache.org/jira/browse/LOG4J2-2653
> Project: Log4j 2
> Issue Type: Improvement
> Components: Tests
> Affects Versions: 3.0.0
> Reporter: Matt Sicker
> Priority: Major
>
> JUnit 5 has a ton of neat features that make writing tests easier and more
> expressive. It provides a compatibility layer for JUnit 4 and 3, so we should
> be able to migrate pretty easily there.
> In order to migrate v4 tests to v5, we'll need to support the following:
> * LoggerContextRule should be converted into a ParameterResolver
> [extension|https://junit.org/junit5/docs/current/user-guide/#extensions]
> which injects a LoggerContext parameter among other types.
> * Test categories should be converted to
> [tags|https://junit.org/junit5/docs/current/user-guide/#writing-tests-tagging-and-filtering].
> * {{@Ignore}} should be replaced with {{@Disabled}} or appropriate
> conditional disabled annotations (also useful for replacing assumeThat()
> tests).
> * Hamcrest must be added as an explicit dependency and/or replaced by
> something better like AssertJ.
> * The other test annotations need to be updated to the new ones.
> * Parameterized tests can use the new parameters annotations to simplify
> things a lot.
> * TemporaryFolder rule can be replaced with {{@TempDir}} parameter injection
> (experimental feature).
> * Other rule usage needs to be converted to use appropriate v5 features or
> turned into extensions.
> Note that this upgrade can only happen in the 3.x branch as JUnit 5 requires
> Java 8.
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