Sun Yaqi reported the issue:

configure --with-import-modules=modular-sdk

make run-test CONF=fastdebug TEST="jdk/modules/etc/VerifyModuleDelegation.java" failed:

`
----------System.out:(46/3114)----------
test VerifyModuleDelegation.checkJavaBase(): success
test VerifyModuleDelegation.checkLoaderDelegation(): failure
java.lang.Error: platform/javafx.swing can't delegate to find classes from app/jdk.unsupported.desktop
    at VerifyModuleDelegation.lambda$checkLoaderDelegation$1(VerifyModuleDelegation.java:77)
    at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
    at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1921)
    at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
    at VerifyModuleDelegation.lambda$checkLoaderDelegation$2(VerifyModuleDelegation.java:68)
    at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1715)
    at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
    at VerifyModuleDelegation.checkLoaderDelegation(VerifyModuleDelegation.java:68)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
    at java.base/java.lang.reflect.Method.invoke(Method.java:578)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
    at org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:599)
    at org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:174)
    at org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46)
    at org.testng.internal.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:822)
    at org.testng.internal.TestInvoker.invokeTestMethods(TestInvoker.java:147)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:128)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
    at org.testng.TestRunner.privateRun(TestRunner.java:764)
    at org.testng.TestRunner.run(TestRunner.java:585)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:384)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:378)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:337)
    at org.testng.SuiteRunner.run(SuiteRunner.java:286)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1218)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
    at org.testng.TestNG.runSuites(TestNG.java:1069)
    at org.testng.TestNG.run(TestNG.java:1037)
    at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:94)
    at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:54)
    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:127)
    at java.base/java.lang.Thread.run(Thread.java:1589)

===============================================
jdk/modules/etc/VerifyModuleDelegation.java
Total tests run: 2, Passes: 1, Failures: 1, Skips: 0
===============================================

----------System.err:(13/753)----------
WARNING: Using incubator modules: jdk.incubator.vector, jdk.incubator.concurrent
java.lang.Exception: failures: 1
    at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:96)
    at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:54)
    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:127)
    at java.base/java.lang.Thread.run(Thread.java:1589)
`