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diff --git a/test/mjsunit/string-add.js b/test/mjsunit/string-add.js
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@@ -0,0 +1,175 @@
+// Copyright 2009 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+assertEquals("ab", "a" + "b", "ll");
+
+assertEquals("12", "1" + "2", "dd");
+assertEquals("123", "1" + "2" + "3", "ddd");
+assertEquals("123", 1 + "2" + "3", "ndd");
+assertEquals("123", "1" + 2 + "3", "dnd");
+assertEquals("123", "1" + "2" + 3, "ddn");
+
+assertEquals("123", "1" + 2 + 3, "dnn");
+assertEquals("123", 1 + "2" + 3, "ndn");
+assertEquals("33", 1 + 2 + "3", "nnd");
+
+var x = "1";
+assertEquals("12", x + 2, "vn");
+assertEquals("12", x + "2", "vd");
+assertEquals("21", 2 + x, "nv");
+assertEquals("21", "2" + x, "dv");
+
+var y = "2";
+assertEquals("12", x + y, "vdvd");
+
+x = 1;
+assertEquals("12", x + y, "vnvd");
+
+y = 2;
+assertEquals(3, x + y, "vnvn");
+
+x = "1";
+assertEquals("12", x + y, "vdvn");
+
+y = "2";
+assertEquals("12", x + y, "vdvd2");
+
+(function(x, y) {
+  var z = "3";
+  var w = "4";
+
+  assertEquals("11", x + x, "xx");
+  assertEquals("12", x + y, "xy");
+  assertEquals("13", x + z, "xz");
+  assertEquals("14", x + w, "xw");
+
+  assertEquals("21", y + x, "yx");
+  assertEquals("22", y + y, "yy");
+  assertEquals("23", y + z, "yz");
+  assertEquals("24", y + w, "yw");
+
+  assertEquals("31", z + x, "zx");
+  assertEquals("32", z + y, "zy");
+  assertEquals("33", z + z, "zz");
+  assertEquals("34", z + w, "zw");
+
+  assertEquals("41", w + x, "wx");
+  assertEquals("42", w + y, "wy");
+  assertEquals("43", w + z, "wz");
+  assertEquals("44", w + w, "ww");
+
+  (function(){x = 1; z = 3;})();
+
+  assertEquals(2, x + x, "x'x");
+  assertEquals("12", x + y, "x'y");
+  assertEquals(4, x + z, "x'z'");
+  assertEquals("14", x + w, "x'w");
+
+  assertEquals("21", y + x, "yx'");
+  assertEquals("22", y + y, "yy");
+  assertEquals("23", y + z, "yz'");
+  assertEquals("24", y + w, "yw");
+
+  assertEquals(4, z + x, "z'x'");
+  assertEquals("32", z + y, "z'y");
+  assertEquals(6, z + z, "z'z'");
+  assertEquals("34", z + w, "z'w");
+
+  assertEquals("41", w + x, "wx'");
+  assertEquals("42", w + y, "wy");
+  assertEquals("43", w + z, "wz'");
+  assertEquals("44", w + w, "ww");
+})("1", "2");
+
+assertEquals("142", "1" + new Number(42), "sN");
+assertEquals("421", new Number(42) + "1", "Ns");
+assertEquals(84, new Number(42) + new Number(42), "NN");
+
+assertEquals("142", "1" + new String("42"), "sS");
+assertEquals("421", new String("42") + "1", "Ss");
+assertEquals("142", "1" + new String("42"), "sS");
+assertEquals("4242", new String("42") + new String("42"), "SS");
+
+assertEquals("1true", "1" + true, "sb");
+assertEquals("true1", true + "1", "bs");
+assertEquals(2, true + true, "bs");
+
+assertEquals("1true", "1" + new Boolean(true), "sB");
+assertEquals("true1", new Boolean(true) + "1", "Bs");
+assertEquals(2, new Boolean(true) + new Boolean(true), "Bs");
+
+assertEquals("1undefined", "1" + void 0, "sv");
+assertEquals("undefined1", (void 0)  + "1", "vs");
+assertTrue(isNaN(void 0 + void 0), "vv");
+
+assertEquals("1null", "1" + null, "su");
+assertEquals("null1", null + "1", "us");
+assertEquals(0, null + null, "uu");
+
+(function (i) {
+  // Check that incoming frames are merged correctly.
+  var x;
+  var y;
+  var z;
+  var w;
+  switch (i) {
+  case 1: x = 42; y = "stry"; z = "strz"; w = 42; break;
+  default: x = "strx", y = 42; z = "strz"; w = 42; break;
+  }
+  var resxx = x + x;
+  var resxy = x + y;
+  var resxz = x + z;
+  var resxw = x + w;
+  var resyx = y + x;
+  var resyy = y + y;
+  var resyz = y + z;
+  var resyw = y + w;
+  var reszx = z + x;
+  var reszy = z + y;
+  var reszz = z + z;
+  var reszw = z + w;
+  var reswx = w + x;
+  var reswy = w + y;
+  var reswz = w + z;
+  var resww = w + w;
+  assertEquals(84, resxx, "swxx");
+  assertEquals("42stry", resxy, "swxy");
+  assertEquals("42strz", resxz, "swxz");
+  assertEquals(84, resxw, "swxw");
+  assertEquals("stry42", resyx, "swyx");
+  assertEquals("strystry", resyy, "swyy");
+  assertEquals("strystrz", resyz, "swyz");
+  assertEquals("stry42", resyw, "swyw");
+  assertEquals("strz42", reszx, "swzx");
+  assertEquals("strzstry", reszy, "swzy");
+  assertEquals("strzstrz", reszz, "swzz");
+  assertEquals("strz42", reszw, "swzw");
+  assertEquals(84, reswx, "swwx");
+  assertEquals("42stry", reswy, "swwy");
+  assertEquals("42strz", reswz, "swwz");
+  assertEquals(84, resww, "swww");
+})(1);