--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/shenandoah/options/TestLoopMiningArguments.java	Mon Dec 10 15:47:44 2018 +0100
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2017, 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 TestLoopMiningArguments
+ * @summary Test that loop mining arguments are sane
+ * @key gc
+ * @requires vm.gc.Shenandoah
+ * @library /test/lib
+ * @run driver TestLoopMiningArguments
+ */
+
+import java.util.*;
+
+import jdk.test.lib.Asserts;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class TestLoopMiningArguments {
+
+    public static void testWith(String msg, boolean cls, int iters, String... args) throws Exception {
+        String[] cmds = Arrays.copyOf(args, args.length + 2);
+        cmds[args.length] = "-XX:+PrintFlagsFinal";
+        cmds[args.length + 1] = "-version";
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(cmds);
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        output.shouldHaveExitValue(0);
+        output.shouldContain("UseCountedLoopSafepoints");
+        output.shouldContain("LoopStripMiningIter");
+
+        Asserts.assertEQ(output.firstMatch("(.+?) UseCountedLoopSafepoints.+?= (.+?) (.+?)", 2), Boolean.toString(cls), msg + ", but got wrong CLS");
+        Asserts.assertEQ(output.firstMatch("(.+?) LoopStripMiningIter.+?= (.+?) (.+?)", 2), String.valueOf(iters), msg + ", but got wrong LSM");
+    }
+
+    public static void main(String[] args) throws Exception {
+        testDefaultGC();
+        testShenandoah();
+    }
+
+    public static void testDefaultGC() throws Exception {
+        testWith("Default GC should have CLS enabled, LSM = 1000",
+                true, 1000);
+
+        testWith("Default GC with +CLS should set LSM = 1",
+                true, 1,
+                "-XX:+UseCountedLoopSafepoints"
+        );
+
+        testWith("Default GC with +CLS should not override LSM>1",
+                true, 10,
+                "-XX:LoopStripMiningIter=10",
+                "-XX:+UseCountedLoopSafepoints"
+        );
+
+        testWith("Default GC with +CLS should not override LSM=1",
+                true, 1,
+                "-XX:LoopStripMiningIter=1",
+                "-XX:+UseCountedLoopSafepoints"
+        );
+
+        testWith("Default GC with +CLS should override LSM=0 to 1",
+                true, 1,
+                "-XX:LoopStripMiningIter=0",
+                "-XX:+UseCountedLoopSafepoints"
+        );
+
+        testWith("Default GC with -CLS should set LSM = 0",
+                false, 0,
+                "-XX:-UseCountedLoopSafepoints"
+        );
+
+        testWith("Default GC with -CLS should override LSM to 0",
+                false, 0,
+                "-XX:LoopStripMiningIter=10",
+                "-XX:-UseCountedLoopSafepoints"
+        );
+    }
+
+    public static void testShenandoah() throws Exception {
+        testWith("Shenandoah should have CLS and LSM enabled",
+                true, 1000,
+                "-XX:+UnlockExperimentalVMOptions",
+                "-XX:+UseShenandoahGC"
+        );
+
+        testWith("Shenandoah with +CLS should set LSM = 1",
+                true, 1,
+                "-XX:+UnlockExperimentalVMOptions",
+                "-XX:+UseShenandoahGC",
+                "-XX:+UseCountedLoopSafepoints"
+        );
+
+        testWith("Shenandoah GC with +CLS should not override LSM>1",
+                true, 10,
+                "-XX:+UnlockExperimentalVMOptions",
+                "-XX:+UseShenandoahGC",
+                "-XX:LoopStripMiningIter=10",
+                "-XX:+UseCountedLoopSafepoints"
+        );
+
+        testWith("Shenandoah GC with +CLS should not override LSM=1",
+                true, 1,
+                "-XX:+UnlockExperimentalVMOptions",
+                "-XX:+UseShenandoahGC",
+                "-XX:LoopStripMiningIter=1",
+                "-XX:+UseCountedLoopSafepoints"
+        );
+
+        testWith("Shenandoah GC with +CLS should override LSM=0 to 1",
+                true, 1,
+                "-XX:+UnlockExperimentalVMOptions",
+                "-XX:+UseShenandoahGC",
+                "-XX:LoopStripMiningIter=0",
+                "-XX:+UseCountedLoopSafepoints"
+        );
+
+        testWith("Shenandoah GC with -CLS should set LSM = 0",
+                false, 0,
+                "-XX:+UnlockExperimentalVMOptions",
+                "-XX:+UseShenandoahGC",
+                "-XX:-UseCountedLoopSafepoints"
+        );
+
+        testWith("Shenandoah GC with -CLS should override LSM to 0",
+                false, 0,
+                "-XX:+UnlockExperimentalVMOptions",
+                "-XX:+UseShenandoahGC",
+                "-XX:LoopStripMiningIter=10",
+                "-XX:-UseCountedLoopSafepoints"
+        );
+    }
+
+}