JUnit 5 Release Notes

Method scanForClassesInPackage(String) in ClasspathScanner now returns a valid list of class names when the package name is equal to the name of a module on the module path.

For consistency with the rest of the JUnit Platform, the experimental LauncherDiscoveryListener is now an interface instead of an abstract class.

New test(Condition<Event>) and nestedContainer(Class<?>, Condition<Event>) methods in EventConditions that allow you to provide conditions for matching against test and nested container events when using the EngineTestKit. For example, test(displayName("my test")) can be used to match against a test whose display name is my test.

The junit-platform-jfr module now also reports execution events for containers, e.g. test classes.

The junit-platform-jfr module now also reports test discovery events for the launcher and registered test engines.

Custom LauncherDiscoveryListener implementations can now be registered via Java’s ServiceLoader mechanism.

Documented constant value of ExclusiveResource.GLOBAL_KEY.

Instances of TestIdentifier and UniqueId now retain less memory because they no longer store String representations of unique IDs.

Improvement of ExclusiveResource handling, if a Node has only read locks and no read-write locks, then descendants are not forced into SAME_THREAD execution, and can run concurrently.

Tools that make multiple calls to the Launcher API should now create a LauncherSession instead in order to allow for executing global setup and teardown code exactly once via the new LauncherSessionListener interface that can be registered via Java’s ServiceLoader mechanism.

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InvocationInterceptor.interceptDynamicTest(Invocation<Void> , ExtensionContext) has been deprecated in favor of InvocationInterceptor.interceptDynamicTest(Invocation<Void> , DynamicTestInvocationContext, ExtensionContext) that allows to access the dynamic test executable via DynamicTestInvocationContext.getExecutable().

Numeric literals used with @CsvSource or CsvFileSource can now be expressed using underscores as in some JVM languages, to improve readability of long numbers like 700_000_000.

Documented constant values in Resources.

New assertInstanceOf methods as a replacement for assertTrue(obj instanceof X) which provide better error messages comparable to those of assertThrows.

Dynamic tests now require less memory thanks to a number of improvements to internal data structures.

Allow rows in @CsvSource to start with a number sign (#)

New ignoreLeadingAndTrailingWhitespace attribute to control whether or not to trim whitespaces in @CsvSource and @CsvFileSource (set to true by default).

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The JUnit Vintage engine now requires less memory and allows for earlier garbage collection thanks to a number of improvements to internal data structures.

StringUtils.nullSafeToString() now returns "null" if the invocation of toString() on the supplied object returns null. Although this is an internal utility, the effect of this change may be witnessed by end users and test engine or extension authors.

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If the toString() implementation of an argument passed to a @ParameterizedTest method returns null, the display name formatter for the parameterized test now treats the name of the corresponding argument as "null" instead of throwing an exception. This fixes a regression introduced in JUnit Jupiter 5.7.0.

Creator functions passed to ExtensionContext.Store.getOrComputeIfAbsent() are now only called once even if they throw an exception.

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The user guide now explains Nested Tests in more detail.

New utility method in TestInstancePreDestroyCallback helps to ensure all test instances are processed when used in conjunction with @Nested tests.

JAVA_17 has been added to the JRE enum for use with JRE-based execution conditions.

The legacy reporting name of top-level test classes is now always their fully-qualified class name. Previously, a textual description was returned for JUnit 3 suites.

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