--- /dev/null	2018-11-30 10:10:44.238550338 +0100
+++ new/test/hotspot/jtreg/gc/shenandoah/options/TestSingleThreaded.java	2018-11-30 21:09:54.547393724 +0100
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+/* @test TestSingleThreaded
+ * @summary test single worker threaded Shenandoah
+ * @key gc
+ * @requires vm.gc.Shenandoah
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
+ *                   -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
+ *                   -XX:ParallelGCThreads=1 -XX:ConcGCThreads=1 TestSingleThreaded
+ */
+
+public class TestSingleThreaded {
+
+    public static void main(String[] args) {
+        // Bug should crash before we get here.
+    }
+}