1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T1.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T1.js
new file mode 100644
index 0000000000..1cbb6fbcb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A4_T1.js
@@ -0,0 +1,30 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    when String.prototype.concat([,[...]]) is called first Call ToString,
+    giving it the this value as its argument
+es5id: 15.5.4.6_A4_T1
+description: Override toString function
+---*/
+
+var __instance = {
+  toString: function() {
+    return "one"
+  }
+};
+
+__instance.concat = String.prototype.concat;
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+if (__instance.concat("two", x) !== "onetwoundefined") {
+  throw new Test262Error('#1: var x; __instance = {toString:function(){return "one"}}; __instance.concat = String.prototype.concat;  __instance.concat("two",x) === "onetwoundefined". Actual: ' + __instance.concat("two", x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);