1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/built-ins/unescape/four-ignore-bad-u.js b/js/src/tests/test262/annexB/built-ins/unescape/four-ignore-bad-u.js
new file mode 100644
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+++ b/js/src/tests/test262/annexB/built-ins/unescape/four-ignore-bad-u.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-unescape-string
+es6id: B.2.1.2
+description: >
+    Does not transform four-character patterns that are not prefixed with the
+    character "u"
+info: |
+    [...]
+    5. Repeat, while k ≠ length,
+       [...]
+       a. Let c be the code unit at index k within string.
+       b. If c is %, then
+          i. If k ≤ length-6 and the code unit at index k+1 within string is u
+             and the four code units at indices k+2, k+3, k+4, and k+5 within
+             string are all hexadecimal digits, then
+             1. Let c be the code unit whose value is the integer represented
+                by the four hexadecimal digits at indices k+2, k+3, k+4, and
+                k+5 within string.
+             2. Increase k by 5.
+       [...]
+---*/
+
+assert.sameValue(unescape('%U0000'), '%U0000');
+assert.sameValue(unescape('%t0000'), '%t0000');
+assert.sameValue(unescape('%v0000'), '%v0000');
+assert.sameValue(unescape('%%0000'), '%\x0000');
+
+reportCompare(0, 0);