--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/NullTest.java	Mon Dec 29 23:38:50 2014 +0100
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2014, 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 com.oracle.truffle.api.dsl.test;
+
+import static com.oracle.truffle.api.dsl.test.TestHelper.*;
+import static org.junit.Assert.*;
+
+import org.junit.*;
+
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.api.dsl.test.NullTestFactory.NullTest1Factory;
+import com.oracle.truffle.api.dsl.test.TypeSystemTest.TestRootNode;
+import com.oracle.truffle.api.dsl.test.TypeSystemTest.ValueNode;
+
+public class NullTest {
+
+    @Test
+    public void testGuardInvocations() {
+        TestRootNode<NullTest1> root = createRoot(NullTest1Factory.getInstance());
+
+        assertEquals("fallback", executeWith(root, (Object) null));
+        assertEquals(true, executeWith(root, true));
+        assertEquals(42L, executeWith(root, 42));
+        assertEquals("string", executeWith(root, "s"));
+        assertEquals("fallback", executeWith(root, (Object) null));
+    }
+
+    @SuppressWarnings("unused")
+    @NodeChild("a")
+    abstract static class NullTest1 extends ValueNode {
+
+        @Specialization
+        long s(long a) {
+            return a;
+        }
+
+        @Specialization
+        boolean s(boolean a) {
+            return a;
+        }
+
+        @Specialization
+        String s(String a) {
+            return "string";
+        }
+
+        @Fallback
+        Object s(Object a) {
+            return "fallback";
+        }
+
+    }
+
+}