WebSockets Next: add test for virtual threads

[mkouba]

No description provided.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit a4f9f57.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

---

Flaky tests - Develocity

⚙️ JVM Tests - JDK 21

📦 extensions/websockets-next/deployment

✖ io.quarkus.websockets.next.test.client.BasicConnectorTest.testClient - History

• Index 0 out of bounds for length 0 - java.lang.ArrayIndexOutOfBoundsException

java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
	at java.base/java.util.concurrent.CopyOnWriteArrayList.elementAt(CopyOnWriteArrayList.java:390)
	at java.base/java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:403)
	at io.quarkus.websockets.next.test.client.BasicConnectorTest.testClient(BasicConnectorTest.java:88)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at io.quarkus.test.QuarkusUnitTest.runExtensionMethod(QuarkusUnitTest.java:500)
	at io.quarkus.test.QuarkusUnitTest.interceptTestMethod(QuarkusUnitTest.java:414)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)

[mkouba]

The flaky BasicConnectorTest should be fixed in #40491.