Release Notes

Clarify TestDescriptor implementation requirements.

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The UniqueId.uniqueIdFormat field has been removed, reducing the size of UniqueId objects.

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JAVA_27 has been added to the JRE enum for use with JRE-based execution conditions.

JUnit Pioneer's DefaultLocaleExtension and DefaultTimeZoneExtension are now part of the JUnit Jupiter. Find examples in the User Guide.

Support the creation of Arguments from iterables. These additions make it easier to dynamically build arguments from collections when using @ParameterizedTest:

Exclude competing @Deprecated factory methods in fallback String-to-Object converter.

Trim internal stack frames from AssertionFailedError stack traces.

Introduce new trimStacktrace(Class<?>) and retainStackTraceElements(int) methods for AssertionFailureBuilder. These allow user defined assertions to trim their stacktrace.

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Deprecate constructors for ForkJoinPoolHierarchicalTestExecutorService in favor of the new ParallelHierarchicalTestExecutorServiceFactory that also supports WorkerThreadPoolHierarchicalTestExecutorService.

Support for creating a ModuleSelector from a java.lang.Module and using its classloader for test discovery.

New WorkerThreadPoolHierarchicalTestExecutorService implementation used for parallel test execution that is backed by a regular thread pool rather than a ForkJoinPool. Engine authors should switch to use ParallelHierarchicalTestExecutorServiceFactory rather than instantiating a concrete HierarchicalTestExecutorService implementation for parallel execution directly.

OpenTestReportGeneratingListener now supports redirecting XML events to a socket via the new junit.platform.reporting.open.xml.socket configuration parameter. When set to a port number, events are sent to 127.0.0.1:<port> instead of being written to a file.

Allow implementations of HierarchicalTestEngine to specify which nodes require the global read lock by overriding the Node.isGlobalReadLockRequired() method to return false.

Introduce new module org.junit.start for writing and running tests. It simplifies using JUnit in compact source files together with a single module import statement. Find an example at the User Guide.

Introduce new dynamicTest(Consumer<? super Configuration>) factory method for dynamic tests. It allows configuring the ExecutionMode of the dynamic test in addition to its display name, test source URI, and executable.

Introduce new dynamicContainer(Consumer<? super Configuration>) factory method for dynamic containers. It allows configuring the ExecutionMode of the dynamic container and/or its children in addition to its display name, test source URI, and children.

Enrich assertInstanceOf failure using the test subject Throwable as cause. It results in the stack trace of the test subject Throwable to get reported along with the failure.

Make implementation of HierarchicalTestExecutorService used for parallel test execution configurable via the new junit.jupiter.execution.parallel.config.executor-service configuration parameter to in order to add support for WorkerThreadPoolHierarchicalTestExecutorService. Please refer to the User Guide for details.

Make ConsoleLauncher compatible with JDK 26 by avoiding final field mutations.

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Allow using @ResourceLock on classes annotated with @ClassTemplate (or @ParameterizedClass).

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The jdk.jfr package is now an optional import when using the junit-platform-launcher as an OSGi bundle.

Legacy documentation regarding Java 8 compatibility has been removed from the User Guide.

A regression introduced in version 6.0.0 caused an exception when using @CsvSource or @CsvFileSource if the delimiter or delimiterString attribute was set to #. This occurred because # was used as the default comment character without an option to change it. To resolve this, a new commentCharacter attribute has been added to both annotations. Its default value remains #, but it can now be customized to avoid conflicts with other control characters.

Fix IllegalAccessError thrown when using the Kotlin-specific assertDoesNotThrow assertion.

Stop reporting discovery issues for synthetic methods, particularly in conjunction with Kotlin suspend functions.

Fix support for test methods with the same signature as package-private methods declared in super classes in different packages.

The org.junit.jupiter.migrationsupport module descriptor has been marked as deprecated for removal.

The @CsvSource and @CsvFileSource annotations now allow specifying a custom comment character using the new commentCharacter attribute.

Improve error message when @ParameterizedClass is used with field injection without providing enough arguments.

Allow calling the TypedArgumentConverter constructor for @Nullable T target types without having to cast class literals to Class<@Nullable T>.

Allow disabling the reporting of discovery issues by the JUnit Vintage engine (including the one reported for its deprecation) by setting the new junit.vintage.discovery.issue.reporting.enabled configuration parameter to false.