Update src/test/java/com/github/copilot/sdk/ThreadFactoryProviderTest.java

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: brunoborges

src/test/java/com/github/copilot/sdk/ThreadFactoryProviderTest.java

@@ -50,14 +50,16 @@ void newSingleThreadExecutorRunsTask() throws Exception {
 
     @Test
     void isVirtualThreadsReturnsBoolean() {
-        // On Java 17 this returns false; on Java 21+ it returns true.
-        // We just verify it doesn't throw.
+        // Unit tests run against exploded classes rather than the packaged
+        // multi-release JAR, so Java 21+ may still load the base implementation
+        // and report false here. Verify only behavior that does not depend on
+        // multi-release class selection.
         boolean result = ThreadFactoryProvider.isVirtualThreads();
         int javaVersion = Runtime.version().feature();
-        if (javaVersion >= 21) {
-            assertTrue(result, "Expected virtual threads on Java 21+");
-        } else {
+        if (javaVersion < 21) {
             assertFalse(result, "Expected platform threads on Java < 21");
+        } else if (result) {
+            assertTrue(javaVersion >= 21, "Virtual threads are only supported on Java 21+");
         }
     }
 }