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Testing / JUnit6 Interview Questions

How do you migrate from JUnit 5 to JUnit 6?

Migrating from JUnit 5 to JUnit 6 is significantly simpler than the JUnit 4 to 5 migration. Because the Jupiter annotation model is unchanged, most projects require only a version bump plus addressing a handful of breaking changes.

JUnit 5 to JUnit 6 migration checklist
StepAction
1. Update dependenciesChange junit-bom version from 5.x.x to 6.1.1; remove explicit version overrides
2. Java 17 baselineEnsure the project targets Java 17 or higher (JUnit 6 requires it)
3. Remove deleted modulesRemove junit-platform-runner and junit-platform-jfr dependencies
4. Fix CSV testsReview @CsvSource and @CsvFileSource tests for malformed CSV (FastCSV is stricter)
5. Remove lineSeparatorRemove lineSeparator attribute from @CsvFileSource (no longer exists)
6. Fix Alphanumeric orderReplace MethodOrderer.Alphanumeric with DisplayName or MethodName
7. Update build toolsUpgrade to Maven Surefire 3.x and Gradle 8.x for JUnit 6 support
8. Update KotlinUpgrade to Kotlin 2.2+ minimum if using Kotlin tests
9. Kotlin suspend testsRemove runBlocking wrappers from suspend test methods
10. Review migrationsupportRemove junit-jupiter-migrationsupport usage (deprecated)
11. Unified versionThe Platform version is now 6.x.x, same as Jupiter -- update any explicit references
<!-- Maven migration: change the BOM version -->
<!-- BEFORE (JUnit 5) -->
<dependency>
    <groupId>org.junit</groupId>
    <artifactId>junit-bom</artifactId>
    <version>5.11.4</version>  <!-- old -->
    <type>pom</type><scope>import</scope>
</dependency>

<!-- AFTER (JUnit 6) -->
<dependency>
    <groupId>org.junit</groupId>
    <artifactId>junit-bom</artifactId>
    <version>6.1.1</version>   <!-- updated -->
    <type>pom</type><scope>import</scope>
</dependency>

<!-- Kotlin tests: remove runBlocking -->
// BEFORE
@Test
fun fetchUser(): Unit = runBlocking {
    val u = service.fetchUser("1")
    assertEquals("Alice", u.name)
}

// AFTER
@Test
suspend fun fetchUser() {
    val u = service.fetchUser("1")
    assertEquals("Alice", u.name)
}

What is the minimum Java version you must target before migrating to JUnit 6?
Which of these migration steps is NOT required when moving from JUnit 5 to JUnit 6?

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