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Testing / JUnit6 Interview Questions

What modules were removed in JUnit 6 and why?

JUnit 6 removed several modules that had been deprecated in earlier JUnit 5.x releases. Knowing what was removed and its replacement is a common interview topic.

Modules removed in JUnit 6
Removed moduleWhat it didReplacement
junit-platform-runnerJUnit 4 @RunWith-based runner that could run JUnit Platform tests on JUnit 4 enginesMigrate to native JUnit 6 engine; use Maven Surefire 3.x or Gradle's JUnit Platform support directly
junit-platform-jfrProvided custom Java Flight Recorder (JFR) events for test discovery and executionJFR integration is now built into the launcher itself -- no separate module needed
junit-platform-suite-commonsInternal helper module for test suite supportFunctionality merged into junit-platform-suite
junit-jupiter-migrationsupportCompatibility layer for JUnit 4 @Rule adapters in JUnit 5Deprecated in JUnit 6.0.0; will be removed in the next major version
junit-vintage-engine (deprecated, not removed)Runs JUnit 3/4 tests on the JUnit PlatformStill present but deprecated; remove JUnit 3/4 tests or use an interim Vintage dependency
<!-- BEFORE (JUnit 5 with platform runner) -->
<dependency>
    <groupId>org.junit.platform</groupId>
    <artifactId>junit-platform-runner</artifactId>  <!-- REMOVED in JUnit 6 -->
    <scope>test</scope>
</dependency>

<!-- AFTER (JUnit 6): use Maven Surefire 3.x directly -->
<plugin>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>3.3.0</version>  <!-- Maven Surefire 3.x required for JUnit 6 -->
</plugin>
<!-- Surefire 3.x discovers JUnit Platform tests natively
     without needing junit-platform-runner -->

<!-- jupiter-migrationsupport: deprecated but still present in 6.0.x
     Remove before JUnit 7 ships -->
<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-migrationsupport</artifactId>  <!-- DEPRECATED -->
    <scope>test</scope>
</dependency>

What replaced the functionality of the removed junit-platform-jfr module in JUnit 6?
Why was junit-platform-runner removed in JUnit 6?

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