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.

<!-- 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)
}

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