--- old/test/gc/shenandoah/options/TestExplicitGC.java	2019-11-11 16:10:28.378341154 +0100
+++ new/test/gc/shenandoah/options/TestExplicitGC.java	2019-11-11 16:10:28.290341159 +0100
@@ -1,4 +1,4 @@
-/*
+'/*
  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -51,11 +51,16 @@
                 "Pause Full"
         };
 
-        String[] concurrent = new String[] {
+        String[] concNormal = new String[] {
                 "Pause Init Mark",
                 "Pause Final Mark",
         };
 
+        String[] concTraversal = new String[] {
+                "Pause Init Traversal",
+                "Pause Final Traversal",
+        };
+
         {
             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
                     "-XX:+UnlockExperimentalVMOptions",
@@ -67,9 +72,12 @@
             for (String p : full) {
                 output.shouldNotContain(p);
             }
-            for (String p : concurrent) {
+            for (String p : concNormal) {
                 output.shouldContain(p);
             }
+            for (String p : concTraversal) {
+                output.shouldNotContain(p);
+            }
         }
 
         {
@@ -84,7 +92,10 @@
             for (String p : full) {
                 output.shouldNotContain(p);
             }
-            for (String p : concurrent) {
+            for (String p : concNormal) {
+                output.shouldNotContain(p);
+            }
+            for (String p : concTraversal) {
                 output.shouldNotContain(p);
             }
         }
@@ -101,9 +112,12 @@
             for (String p : full) {
                 output.shouldNotContain(p);
             }
-            for (String p : concurrent) {
+            for (String p : concNormal) {
                 output.shouldContain(p);
             }
+            for (String p : concTraversal) {
+                output.shouldNotContain(p);
+            }
         }
 
         {
@@ -111,6 +125,27 @@
                     "-XX:+UnlockExperimentalVMOptions",
                     "-XX:+UseShenandoahGC",
                     "-verbose:gc",
+                    "-XX:+ExplicitGCInvokesConcurrent",
+                    "-XX:ShenandoahGCMode=traversal",
+                     TestExplicitGC.class.getName(),
+                    "test");
+            OutputAnalyzer output = new OutputAnalyzer(pb.start());
+            for (String p : full) {
+                output.shouldNotContain(p);
+            }
+            for (String p : concNormal) {
+                output.shouldNotContain(p);
+            }
+            for (String p : concTraversal) {
+                output.shouldContain(p);
+            }
+       }
+
+        {
+            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+                    "-XX:+UnlockExperimentalVMOptions",
+                    "-XX:+UseShenandoahGC",
+                    "-verbose:gc",
                     "-XX:-ExplicitGCInvokesConcurrent",
                     TestExplicitGC.class.getName(),
                     "test");
@@ -118,7 +153,10 @@
             for (String p : full) {
                 output.shouldContain(p);
             }
-            for (String p : concurrent) {
+            for (String p : concNormal) {
+                output.shouldNotContain(p);
+            }
+            for (String p : concTraversal) {
                 output.shouldNotContain(p);
             }
         }