1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/S15.10.2.12_A4_T5.js b/js/src/tests/test262/built-ins/RegExp/S15.10.2.12_A4_T5.js
new file mode 100644
index 0000000000..f3bcc0c6d0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/S15.10.2.12_A4_T5.js
@@ -0,0 +1,29 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    The production CharacterClassEscape :: W evaluates by returning the set of all characters not
+    included in the set returned by CharacterClassEscape :: w
+es5id: 15.10.2.12_A4_T5
+description: non-w
+---*/
+
+var non_w = "\f\n\r\t\v~`!@#$%^&*()-+={[}]|\\:;'<,>./? " + '"';
+var regexp_W = /\W/g;
+var k = 0;
+while (regexp_W.exec(non_w) !== null) {
+   k++;
+}
+
+assert.sameValue(non_w.length, k, 'The value of non_w.length is expected to equal the value of k');
+
+var non_W = "_0123456789_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+
+assert.sameValue(
+  /\W/.exec(non_W),
+  null,
+  '/W/.exec(""_0123456789_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"") must return null'
+);
+
+reportCompare(0, 0);