1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/S9.8.1_A1.js b/js/src/tests/test262/built-ins/String/S9.8.1_A1.js
new file mode 100644
index 0000000000..1d8fea77c0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/S9.8.1_A1.js
@@ -0,0 +1,25 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: If m is NaN, return the string "NaN"
+es5id: 9.8.1_A1
+description: NaN convert to String by explicit transformation
+---*/
+
+// CHECK#1
+if (String(NaN) !== "NaN") {
+  throw new Test262Error('#1: String(NaN) === Not-a-Number Actual: ' + (String(NaN)));
+}
+
+// CHECK#2
+if (String(Number.NaN) !== "NaN") {
+  throw new Test262Error('#2: String(Number.NaN) === Not-a-Number Actual: ' + (String(Number.NaN)));
+}
+
+// CHECK#3
+if (String(Number("asasa")) !== "NaN") {
+  throw new Test262Error('#3: String(Number("asasa")) === Not-a-Number Actual: ' + (String(Number("asasa"))));
+}
+
+reportCompare(0, 0);