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diff --git a/test/src/jdk/nashorn/internal/runtime/LexicalBindingTest.java b/test/src/jdk/nashorn/internal/runtime/LexicalBindingTest.java
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+/*
+ * 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 jdk.nashorn.internal.runtime;
+
+import jdk.nashorn.api.scripting.NashornScriptEngineFactory;
+import org.testng.annotations.Test;
+
+import javax.script.Bindings;
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptException;
+import javax.script.SimpleScriptContext;
+
+import static org.testng.Assert.assertEquals;
+
+/**
+ * Top-level lexical binding tests.
+ *
+ * @test
+ * @run testng jdk.nashorn.internal.runtime.LexicalBindingTest
+ */
+@SuppressWarnings("javadoc")
+public class LexicalBindingTest {
+
+    final static String LANGUAGE_ES6 = "--language=es6";
+    final static int NUMBER_OF_CONTEXTS = 20;
+    final static int MEGAMORPHIC_LOOP_COUNT = 20;
+
+    /**
+     * Test access to global var-declared variables for shared script classes with multiple globals.
+     */
+    @Test
+    public static void megamorphicVarTest() throws ScriptException, InterruptedException {
+        final NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
+        final ScriptEngine e = factory.getScriptEngine();
+        final ScriptContext[] contexts = new ScriptContext[NUMBER_OF_CONTEXTS];
+        final String sharedScript = "foo";
+
+
+        for (int i = 0; i < NUMBER_OF_CONTEXTS; i++) {
+            final ScriptContext context = contexts[i] = new SimpleScriptContext();
+            final Bindings b = e.createBindings();
+            context.setBindings(b, ScriptContext.ENGINE_SCOPE);
+            assertEquals(e.eval("var foo = '" + i + "';", context), null);
+        }
+
+        for (int i = 0; i < NUMBER_OF_CONTEXTS; i++) {
+            final ScriptContext context = contexts[i];
+            assertEquals(e.eval(sharedScript, context), String.valueOf(i));
+        }
+    }
+
+    /**
+     * Test access to global lexically declared variables for shared script classes with multiple globals.
+     */
+    @Test
+    public static void megamorphicMultiGlobalLetTest() throws ScriptException, InterruptedException {
+        final NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
+        final ScriptEngine e = factory.getScriptEngine(LANGUAGE_ES6);
+        final ScriptContext[] contexts = new ScriptContext[NUMBER_OF_CONTEXTS];
+        final String sharedScript = "foo";
+
+
+        for (int i = 0; i < NUMBER_OF_CONTEXTS; i++) {
+            final ScriptContext context = contexts[i] = new SimpleScriptContext();
+            final Bindings b = e.createBindings();
+            context.setBindings(b, ScriptContext.ENGINE_SCOPE);
+            assertEquals(e.eval("let foo = '" + i + "';", context), null);
+        }
+
+        for (int i = 0; i < NUMBER_OF_CONTEXTS; i++) {
+            final ScriptContext context = contexts[i];
+            assertEquals(e.eval(sharedScript, context), String.valueOf(i));
+        }
+    }
+
+
+    /**
+     * Test access to global lexically declared variables for shared script classes with single global.
+     */
+    @Test
+    public static void megamorphicSingleGlobalLetTest() throws ScriptException, InterruptedException {
+        final NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
+        final ScriptEngine e = factory.getScriptEngine(LANGUAGE_ES6);
+        final String sharedGetterScript = "foo";
+        final String sharedSetterScript = "foo = 1";
+
+        for (int i = 0; i < MEGAMORPHIC_LOOP_COUNT; i++) {
+            assertEquals(e.eval(sharedSetterScript), 1);
+            assertEquals(e.eval(sharedGetterScript), 1);
+            assertEquals(e.eval("delete foo; a" + i + " = 1; foo = " + i + ";"), i);
+            assertEquals(e.eval(sharedGetterScript), i);
+        }
+
+        assertEquals(e.eval("let foo = 'foo';"), null);
+        assertEquals(e.eval(sharedGetterScript), "foo");
+        assertEquals(e.eval(sharedSetterScript), 1);
+        assertEquals(e.eval(sharedGetterScript), 1);
+        assertEquals(e.eval("this.foo"), MEGAMORPHIC_LOOP_COUNT - 1);
+    }
+
+    /**
+     * Test access to global lexically declared variables for shared script classes with single global.
+     */
+    @Test
+    public static void megamorphicInheritedGlobalLetTest() throws ScriptException, InterruptedException {
+        final NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
+        final ScriptEngine e = factory.getScriptEngine(LANGUAGE_ES6);
+        final String sharedGetterScript = "foo";
+        final String sharedSetterScript = "foo = 1";
+
+        for (int i = 0; i < MEGAMORPHIC_LOOP_COUNT; i++) {
+            assertEquals(e.eval(sharedSetterScript), 1);
+            assertEquals(e.eval(sharedGetterScript), 1);
+            assertEquals(e.eval("delete foo; a" + i + " = 1; Object.prototype.foo = " + i + ";"), i);
+            assertEquals(e.eval(sharedGetterScript), i);
+        }
+
+        assertEquals(e.eval("let foo = 'foo';"), null);
+        assertEquals(e.eval(sharedGetterScript), "foo");
+        assertEquals(e.eval(sharedSetterScript), 1);
+        assertEquals(e.eval(sharedGetterScript), 1);
+        assertEquals(e.eval("this.foo"), MEGAMORPHIC_LOOP_COUNT - 1);
+    }
+
+    /**
+     * Test multi-threaded access to global lexically declared variables for shared script classes with multiple globals.
+     */
+    @Test
+    public static void multiThreadedLetTest() throws ScriptException, InterruptedException {
+        final NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
+        final ScriptEngine e = factory.getScriptEngine(LANGUAGE_ES6);
+        final Bindings b = e.createBindings();
+        final ScriptContext origContext = e.getContext();
+        final ScriptContext newCtxt = new SimpleScriptContext();
+        newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+        final String sharedScript = "foo";
+
+        assertEquals(e.eval("let foo = 'original context';", origContext), null);
+        assertEquals(e.eval("let foo = 'new context';", newCtxt), null);
+
+        final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
+        final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+
+        assertEquals(e.eval("foo = 'newer context';", newCtxt), "newer context");
+        final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
+        final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));
+
+        t3.start();
+        t4.start();
+        t3.join();
+        t4.join();
+
+        assertEquals(e.eval(sharedScript), "original context");
+        assertEquals(e.eval(sharedScript, newCtxt), "newer context");
+    }
+
+    private static class ScriptRunner implements Runnable {
+
+        final ScriptEngine engine;
+        final ScriptContext context;
+        final String source;
+        final Object expected;
+        final int iterations;
+
+        ScriptRunner(final ScriptEngine engine, final ScriptContext context, final String source, final Object expected, final int iterations) {
+            this.engine = engine;
+            this.context = context;
+            this.source = source;
+            this.expected = expected;
+            this.iterations = iterations;
+        }
+
+        @Override
+        public void run() {
+            try {
+                for (int i = 0; i < iterations; i++) {
+                    assertEquals(engine.eval(source, context), expected);
+                }
+            } catch (final ScriptException se) {
+                throw new RuntimeException(se);
+            }
+        }
+    }
+}