--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.test/src/org/graalvm/compiler/replacements/test/FoldTest.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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.
+ */
+package org.graalvm.compiler.replacements.test;
+
+import org.graalvm.compiler.api.directives.GraalDirectives;
+import org.graalvm.compiler.api.replacements.ClassSubstitution;
+import org.graalvm.compiler.api.replacements.Fold;
+import org.graalvm.compiler.api.replacements.MethodSubstitution;
+import org.graalvm.compiler.bytecode.BytecodeProvider;
+import org.graalvm.compiler.nodes.ReturnNode;
+import org.graalvm.compiler.nodes.StartNode;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins;
+import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins.Registration;
+import org.graalvm.compiler.nodes.graphbuilderconf.NodeIntrinsicPluginFactory.InjectionProvider;
+import org.graalvm.compiler.replacements.NodeIntrinsificationProvider;
+import org.junit.Test;
+
+public class FoldTest extends ReplacementsTest {
+
+    private static class TestMethod {
+
+        public static int test() {
+            return 42;
+        }
+    }
+
+    static class FoldUtils {
+
+        private int number;
+
+        FoldUtils(int number) {
+            this.number = number;
+        }
+
+        @Fold
+        static int multiply(int a, int b) {
+            // we want to test whether @Fold works, so prevent automatic constant folding
+            return a * GraalDirectives.opaque(b);
+        }
+
+        @Fold
+        int getNumber() {
+            // we want to test whether @Fold works, so prevent automatic constant folding
+            return GraalDirectives.opaque(number);
+        }
+    }
+
+    @ClassSubstitution(TestMethod.class)
+    private static class TestMethodSubstitution {
+
+        private static final FoldUtils utils = new FoldUtils(21);
+
+        @MethodSubstitution
+        public static int test() {
+            return FoldUtils.multiply(utils.getNumber(), 2);
+        }
+    }
+
+    @Override
+    protected void registerInvocationPlugins(InvocationPlugins invocationPlugins) {
+        InjectionProvider injection = new NodeIntrinsificationProvider(getMetaAccess(), getSnippetReflection(), getProviders().getForeignCalls(), null);
+        new PluginFactory_FoldTest().registerPlugins(invocationPlugins, injection);
+        BytecodeProvider replacementBytecodeProvider = getSystemClassLoaderBytecodeProvider();
+        Registration r = new Registration(invocationPlugins, TestMethod.class, replacementBytecodeProvider);
+        r.registerMethodSubstitution(TestMethodSubstitution.class, "test");
+        super.registerInvocationPlugins(invocationPlugins);
+    }
+
+    public static int callTest() {
+        return TestMethod.test();
+    }
+
+    @Override
+    protected boolean checkHighTierGraph(StructuredGraph graph) {
+        // check that folding happened correctly
+        StartNode start = graph.start();
+        assert start.next() instanceof ReturnNode : "expected ReturnNode, got " + start.next();
+
+        ReturnNode ret = (ReturnNode) start.next();
+        assert ret.result().isConstant() : "expected ConstantNode, got " + ret.result();
+        return true;
+    }
+
+    @Test
+    public void snippetTest() {
+        test("callTest");
+    }
+}