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README

This repository is the home of JUnit Platform, Jupiter, and Vintage.

Latest Releases

General Availability (GA): JUnit 6.1.1 (June 28, 2026)
Preview (Milestone/Release Candidate): N/A

Documentation

Contributing

Contributions to JUnit are both welcomed and appreciated. For specific guidelines regarding contributions, please see CONTRIBUTING.md in the root directory of the project. Those willing to use milestone or SNAPSHOT releases are encouraged to file feature requests and bug reports using the project's issue tracker. Issues marked with an up-for-grabs label are specifically targeted for community contributions.

Getting Help

Ask JUnit-related questions on StackOverflow or use the Q&A category on GitHub Discussions.

Continuous Integration Builds

Official CI build server used to perform quick checks on submitted pull requests and for build matrices including the latest released OpenJDK and early access builds of the next OpenJDK.

Code Coverage

Code coverage using JaCoCo for the latest build is available on Codecov.

A code coverage report can also be generated locally via the Gradle Wrapper by executing ./gradlew clean jacocoRootReport. The results will be available in build/reports/jacoco/jacocoRootReport/html/index.html.

Develocity

JUnit utilizes Develocity for Build Scans, Build Cache, and Predictive Test Selection.

The latest Build Scans are available on ge.junit.org. Currently, only core team members can publish Build Scans on that server. You can, however, publish a Build Scan to scans.gradle.com by using the --scan parameter explicitly.

The remote Build Cache is enabled by default for everyone so that local builds can reuse task outputs from previous CI builds.

Building from Source

You need JDK 25 to build JUnit. Gradle toolchains are used to detect and potentially download additional JDKs for compilation and test execution.

All modules can be built and tested with the Gradle Wrapper using the following command:

./gradlew build

All modules can be installed in a local Maven repository for consumption in other local projects via the following command:

./gradlew publishToMavenLocal

Dependency Metadata

Consult the Dependency Metadata section of the User Guide for a list of all artifacts of the JUnit Platform, JUnit Jupiter, and JUnit Vintage.

Extension points exported contracts — how you extend this code

Transformer (Interface)

A transformer for values of type S to type T. The Transformer interface is similar to {@link [14 implementers]

junit-platform-commons/src/main/java/org/junit/platform/commons/function/Try.java

DetailsPrintingListener (Interface)

@since 1.0 [6 implementers]

junit-platform-console/src/main/java/org/junit/platform/console/output/DetailsPrintingListener.java

ArgumentsAggregator (Interface)

ArgumentsAggregator is an abstraction for the aggregation of arguments provided by an {@link org.junit.jupiter.p [15 implementers]

junit-jupiter-params/src/main/java/org/junit/jupiter/params/aggregator/ArgumentsAggregator.java

Filterable (Interface)

Filterable is implemented by org.junit.platform.engine.TestDescriptor TestDescriptors that may register [9 implementers]

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/Filterable.java

ClassOrderer (Interface)

ClassOrderer defines the API for ordering top-level test classes and Nested @Nested test classes. In [10 implementers]

junit-jupiter-api/src/main/java/org/junit/jupiter/api/ClassOrderer.java

TestEngine (Interface)

A TestEngine facilitates discovery and execution of tests for a particular programming model. [10 implementers]

junit-platform-engine/src/main/java/org/junit/platform/engine/TestEngine.java

LauncherDiscoveryListener (Interface)

Register a concrete implementation of this interface with a {@link org.junit.platform.launcher.core.LauncherDiscoveryReq [13 …

junit-platform-launcher/src/main/java/org/junit/platform/launcher/LauncherDiscoveryListener.java

InterfaceWithGenericObjectParameter (Interface)

(no doc) [19 implementers]

platform-tests/src/test/java/org/junit/platform/commons/util/ReflectionUtilsWithGenericTypeHierarchiesTests.java

Core symbols most depended-on inside this repo

assertEquals

called by 1796

junit-jupiter-api/src/main/java/org/junit/jupiter/api/Assertions.java

called by 1242

junit-jupiter-api/src/main/java/org/junit/jupiter/api/Named.java

get

called by 830

junit-jupiter-api/src/main/java/org/junit/jupiter/api/extension/ExtensionContext.java

getName

called by 775

junit-jupiter-api/src/main/java/org/junit/jupiter/api/Named.java

assertTrue

called by 712

junit-jupiter-api/src/main/java/org/junit/jupiter/api/Assertions.java

map

called by 655

junit-platform-commons/src/main/java/org/junit/platform/commons/util/StringUtils.java

test

called by 643

jupiter-tests/src/test/java/org/junit/jupiter/engine/extension/AutoCloseTests.java

isEmpty

called by 545

junit-platform-launcher/src/main/java/org/junit/platform/launcher/tagexpression/Stack.java

Shape

Method 13,537

Class 3,232

Interface 257

Enum 64

Languages

Java100%

Modules by API surface

jupiter-tests/src/test/java/org/junit/jupiter/params/ParameterizedTestIntegrationTests.java348 symbols

jupiter-tests/src/test/java/org/junit/jupiter/params/ParameterizedClassIntegrationTests.java301 symbols

platform-tests/src/test/java/org/junit/platform/commons/util/ReflectionUtilsTests.java300 symbols

jupiter-tests/src/test/java/org/junit/jupiter/engine/extension/TempDirectoryTests.java207 symbols

platform-tests/src/test/java/org/junit/platform/engine/support/hierarchical/ParallelExecutionIntegrationTests.java154 symbols

platform-tests/src/test/java/org/junit/platform/engine/discovery/DiscoverySelectorsTests.java147 symbols

jupiter-tests/src/test/java/org/junit/jupiter/engine/ClassTemplateInvocationTests.java142 symbols

platform-tests/src/test/java/org/junit/platform/commons/util/AnnotationUtilsTests.java135 symbols

jupiter-tests/src/test/java/org/junit/jupiter/params/provider/MethodArgumentsProviderTests.java133 symbols

jupiter-tests/src/test/java/org/junit/jupiter/api/AssertArrayEqualsAssertionsTests.java123 symbols

jupiter-tests/src/test/java/org/junit/jupiter/engine/extension/OrderedMethodTests.java119 symbols

jupiter-tests/src/test/java/org/junit/jupiter/engine/extension/ExtensionRegistrationViaParametersAndFieldsTests.java117 symbols

Dependencies from manifests, versioned

junit:junit1×

org.junit.jupiter:junit-jupiter1×

org.junit.platform:junit-platform-commons1×

org.junit.platform:junit-platform-reporting1×

org.junit.vintage:junit-vintage-engine1×

org.junit:junit-bom1×

@antora/collector-extension1.0.3 · 1×

@antora/lunr-extension1.0.0-alpha.13 · 1×

@asciidoctor/tabs1.0.0-beta.6 · 1×

@springio/antora-extensions1.14.11 · 1×

@springio/antora-xref-extension1.0.0-alpha.5 · 1×

antora3.2.0-alpha.11 · 1×

For agents

$ claude mcp add junit-framework \
  -- python -m otcore.mcp_server <graph>

⬇ download graph artifact