--- old/test/hotspot/jtreg/gc/shenandoah/options/TestHeuristicsUnlock.java	2020-04-04 02:23:32.409204472 +0200
+++ new/test/hotspot/jtreg/gc/shenandoah/options/TestHeuristicsUnlock.java	2020-04-04 02:23:32.299205489 +0200
@@ -49,6 +49,8 @@
         testWith("-XX:ShenandoahGCHeuristics=static", Mode.PRODUCT);
         testWith("-XX:ShenandoahGCHeuristics=compact", Mode.PRODUCT);
 
+        testWith("-XX:ShenandoahGCMode=iu", Mode.PRODUCT);
+
         testWith("-XX:ShenandoahGCHeuristics=aggressive", Mode.DIAGNOSTIC);
         testWith("-XX:ShenandoahGCHeuristics=passive", Mode.DIAGNOSTIC);
     }