It can be convenient to write TestNG/JUnit tests that can be patched into a system module.

This does not currently work. It does not find any tests:

===============================================
a/b/c/jdk.jpackage/jdk/jpackage/internal/MyTest.java
Total tests run: 0, Passes: 0, Failures: 0, Skips: 0
===============================================



Although it does not show up in the .jtr file, if the standalone rerun command is executed, it shows the following:

JavaTest Message: JUnit Platform Failure(s): 1

java.lang.reflect.InaccessibleObjectException: Unable to make public void jdk.jpackage.internal.MyTest.test() accessible: module jdk.jpackage does not "exports jdk.jpackage.internal" to unnamed module @566f8caf
at java.base/java.lang.reflect.AccessibleObject.throwInaccessibleObjectException(AccessibleObject.java:387)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:363)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:311)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:201)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:195)
at org.junit.runners.model.FrameworkMethod.<init>(FrameworkMethod.java:35)
at org.junit.runners.model.TestClass.scanAnnotatedMembers(TestClass.java:66)
at org.junit.runners.model.TestClass.<init>(TestClass.java:57)
at org.junit.runners.JUnit4.<init>(JUnit4.java:23)
at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder$DefensiveJUnit4Builder.runnerForClass(DefensiveAllDefaultPossibilitiesBuilder.java:129)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:70)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:37)
at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder.runnerForClass(DefensiveAllDefaultPossibilitiesBuilder.java:57)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:70)
at org.junit.vintage.engine.discovery.ClassSelectorResolver.resolveTestClass(ClassSelectorResolver.java:66)
at org.junit.vintage.engine.discovery.ClassSelectorResolver.resolve(ClassSelectorResolver.java:47)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:134)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1602)
at java.base/java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:129)
at java.base/java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:527)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:513)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:150)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:647)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:185)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:125)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:91)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:82)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:113)
at org.junit.vintage.engine.discovery.VintageDiscoverer.discover(VintageDiscoverer.java:42)
at org.junit.vintage.engine.VintageTestEngine.discover(VintageTestEngine.java:64)
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:152)
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverSafely(EngineDiscoveryOrchestrator.java:134)
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:108)
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:80)
at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:110)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
at com.sun.javatest.regtest.agent.JUnitRunner.runWithJUnitPlatform(JUnitRunner.java:126)
at com.sun.javatest.regtest.agent.JUnitRunner.main(JUnitRunner.java:85)
at com.sun.javatest.regtest.agent.JUnitRunner.main(JUnitRunner.java:51)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1589)

Test run finished after 15 ms
[ 3 containers found ]
[ 0 containers skipped ]
[ 3 containers started ]
[ 0 containers aborted ]
[ 3 containers successful ]
[ 0 containers failed ]
[ 1 tests found ]
[ 0 tests skipped ]
[ 1 tests started ]
[ 0 tests aborted ]
[ 0 tests successful ]
[ 1 tests failed ]


java.lang.Exception: JUnit test failure
at com.sun.javatest.regtest.agent.JUnitRunner.runWithJUnitPlatform(JUnitRunner.java:141)
at com.sun.javatest.regtest.agent.JUnitRunner.main(JUnitRunner.java:85)
at com.sun.javatest.regtest.agent.JUnitRunner.main(JUnitRunner.java:51)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1589)

JavaTest Message: Test threw exception: java.lang.Exception: JUnit test failure
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.Exception: JUnit test failure