--- /dev/null	2014-04-01 17:50:00.000000000 +0400
+++ new/test/java/lang/invoke/LambdaFormTest.java	2014-04-01 17:49:59.000000000 +0400
@@ -0,0 +1,78 @@
+/*
+ * 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.
+ */
+
+/* @test
+ * @summary unit tests for java.lang.invoke.LambdaForm
+ * @run junit/othervm test.java.lang.invoke.LambdaFormTest
+ */
+package test.java.lang.invoke;
+
+import org.junit.Test;
+import java.lang.reflect.Method;
+import static org.junit.Assert.*;
+
+public class LambdaFormTest {
+    static final Method M_shortenSignature;
+    static {
+        try {
+            Class<?> impl = Class.forName("java.lang.invoke.LambdaForm", false, null);
+            Method m = impl.getDeclaredMethod("shortenSignature", String.class);
+            m.setAccessible(true);
+            M_shortenSignature = m;
+        } catch(Exception e) {
+            throw new AssertionError(e);
+        }
+    }
+
+    public static String shortenSignature(String signature) throws ReflectiveOperationException {
+        return (String)M_shortenSignature.invoke(null, signature);
+    }
+
+    @Test
+    public void testShortenSignature() throws ReflectiveOperationException {
+        for (String s : new String[] {
+                // invariant strings:
+                "L", "LL", "ILL", "LIL", "LLI", "IILL", "ILIL", "ILLI",
+                // a few mappings:
+                "LLL=L3", "LLLL=L4", "LLLLLLLLLL=L10",
+                "IIIDDD=I3D3", "IDDD=ID3", "IIDDD=IID3", "IIID=I3D", "IIIDD=I3DD"
+            }) {
+            String s2 = s.substring(s.indexOf('=')+1);
+            String s1 = s.equals(s2) ? s : s.substring(0, s.length() - s2.length() - 1);
+            // mix the above cases with before and after reps of Z*
+            for (int k = -3; k <= 3; k++) {
+                String beg = (k < 0 ? "ZZZZ".substring(-k) : "");
+                String end = (k > 0 ? "ZZZZ".substring(+k) : "");
+                String ks1 = beg+s1+end;
+                String ks2 = shortenSignature(beg)+s2+shortenSignature(end);
+                String ks3 = shortenSignature(ks1);
+                assertEquals(ks2, ks3);
+            }
+        }
+    }
+
+    public static void main(String[] args) throws ReflectiveOperationException {
+        LambdaFormTest test = new LambdaFormTest();
+        test.testShortenSignature();
+    }
+}