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Testing / JUnit6 Interview Questions

What is JUnit 6 and when was it released?

JUnit 6 is the current major version of the JUnit testing framework for Java and the JVM, released as GA on September 30, 2025 -- eight years after JUnit 5. The latest stable release is 6.1.1 (mid-2026). Unlike the disruptive JUnit 4 to 5 migration (which rewrote the entire annotation model), JUnit 6 is a deliberate maturation rather than a revolution.

JUnit 6 is built on the same Jupiter architecture introduced in JUnit 5 and adds:

  • Java 17 minimum baseline (up from Java 8 in JUnit 5)
  • Unified versioning across Platform, Jupiter, and Vintage modules
  • JSpecify nullability annotations across the entire public API
  • Native Kotlin coroutine support (suspend test methods)
  • CancellationToken API for cooperative cancellation and fail-fast execution
  • FastCSV replacing the unmaintained univocity-parsers library
  • Removal of long-deprecated modules (junit-platform-runner, junit-platform-jfr)
JUnit 6 at a glance
PropertyDetail
GA release dateSeptember 30, 2025
Latest stable6.1.1 (mid-2026)
Minimum JavaJava 17
Minimum KotlinKotlin 2.2
ArchitectureJupiter engine (same as JUnit 5)
Migration from JUnit 5Mostly a version bump; same annotation model
When was JUnit 6 released as a GA (generally available) version?
What is the minimum Java version required by JUnit 6?

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