--- old/test/hotspot/jtreg/gc/shenandoah/TestGCThreadGroups.java	2020-04-04 02:23:21.785302695 +0200
+++ new/test/hotspot/jtreg/gc/shenandoah/TestGCThreadGroups.java	2020-04-04 02:23:21.676303703 +0200
@@ -78,6 +78,25 @@
  *      TestGCThreadGroups
  */
 
+/**
+ * @test TestGCThreadGroups
+ * @summary Test Shenandoah GC uses concurrent/parallel threads correctly
+ * @key gc
+ * @requires vm.gc.Shenandoah & !vm.graal.enabled
+ *
+ * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
+ *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
+ *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
+ *      -Dtarget=1000
+ *      TestGCThreadGroups
+ *
+ * @run main/othervm -Xmx16m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
+ *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
+ *      -XX:ConcGCThreads=2 -XX:ParallelGCThreads=4
+ *      -Dtarget=1000
+ *      TestGCThreadGroups
+*/
+
 public class TestGCThreadGroups {
 
     static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation, around 1K cycles to handle