1 files changed, 23 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T6.js b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T6.js
new file mode 100644
index 0000000000..ab6cc06c17
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/concat/S15.5.4.6_A1_T6.js
@@ -0,0 +1,23 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: String.prototype.concat([,[...]])
+es5id: 15.5.4.6_A1_T6
+description: >
+    Call concat([,[...]]) function with x argument of new String
+    object, where x is undefined variable
+---*/
+
+//////////////////////////////////////////////////////////////////////////////
+//CHECK#1
+//since ToString(undefined) evaluates to "undefined" concat(undefined) evaluates to concat("undefined")
+if (new String("lego").concat(x) !== "legoundefined") {
+  throw new Test262Error('#1: var x; new String("lego").concat(x) === "legoundefined". Actual: ' + new String("lego").concat(x));
+}
+//
+//////////////////////////////////////////////////////////////////////////////
+
+var x;
+
+reportCompare(0, 0);