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Testing / JUnit6 Interview Questions

What is the JUnit 6 architecture and what are its three main components?

JUnit 6 retains the three-tier architecture introduced in JUnit 5, with one key change: all three components now share a single unified version number instead of having separate version schemes.

JUnit 6 three-component architecture
ComponentArtifact prefixRole
JUnit Platformjunit-platform-*Foundation: defines TestEngine SPI, launcher API, and the mechanism for discovering and executing tests. IDEs and build tools integrate at this layer.
JUnit Jupiterjunit-jupiter-*Writing tests: provides all annotations (@Test, @BeforeEach, @ParameterizedTest, etc.), assertions, and extension APIs used by developers writing tests.
JUnit Vintagejunit-vintage-*Legacy: runs JUnit 3 and JUnit 4 tests on the JUnit Platform. Deprecated in JUnit 6 -- will be removed in a future major version.
<!-- Maven BOM: single version for all modules in JUnit 6 -->
<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.junit</groupId>
      <artifactId>junit-bom</artifactId>
      <version>6.1.1</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter</artifactId>
    <scope>test</scope>
    <!-- Version resolved by BOM: 6.1.1 -->
  </dependency>
</dependencies>

<!-- JUnit 5 used different version numbers:
     Platform: 1.x.x
     Jupiter:  5.x.x
     Vintage:  5.x.x

     JUnit 6: all three use 6.x.x -->

Key change from JUnit 5: in JUnit 5, the Platform used version 1.x.x while Jupiter and Vintage used 5.x.x. This caused confusion in dependency management. JUnit 6 unifies all three under the same 6.x.x version, making BOM usage straightforward and eliminating version mismatch errors.

In JUnit 5, what version number scheme did the Platform component use?
What is the status of JUnit Vintage in JUnit 6?

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