--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/vm/EngineAsynchTest.java	Thu Oct 15 09:42:50 2015 +0200
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2012, 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 com.oracle.truffle.api.test.vm;
+
+import com.oracle.truffle.api.source.Source;
+import com.oracle.truffle.api.vm.PolyglotEngine;
+import java.util.concurrent.Executors;
+import static org.junit.Assert.assertNotNull;
+import org.junit.Before;
+import org.junit.Test;
+
+public class EngineAsynchTest {
+    PolyglotEngine tvm;
+
+    @Before
+    public void initInDifferentThread() throws InterruptedException {
+        tvm = PolyglotEngine.buildNew().executor(Executors.newSingleThreadExecutor()).build();
+    }
+
+    @Test
+    public void npeWhenCastingAs() throws Exception {
+        PolyglotEngine.Language language1 = tvm.getLanguages().get("application/x-test-import-export-1");
+        PolyglotEngine.Language language2 = tvm.getLanguages().get("application/x-test-import-export-2");
+        language2.eval(Source.fromText("explicit.value=42", "define 42"));
+
+        PolyglotEngine.Value value = language1.eval(Source.fromText("return=value", "42.value"));
+        String res = value.as(String.class);
+        assertNotNull(res);
+    }
+}