1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-first-code-unit.js b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-first-code-unit.js
new file mode 100644
index 0000000000..dba2e3dc85
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/codePointAt/return-first-code-unit.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.3
+description: >
+  Returns code point of LeadSurrogate if not followed by a valid TrailSurrogate.
+info: |
+  21.1.3.3 String.prototype.codePointAt ( pos )
+
+  ...
+  8. Let first be the code unit value of the element at index position in the
+  String S.
+  9. If first < 0xD800 or first > 0xDBFF or position+1 = size, return first.
+  10. Let second be the code unit value of the element at index position+1 in
+  the String S.
+  11. If second < 0xDC00 or second > 0xDFFF, return first.
+---*/
+
+assert.sameValue('\uD800\uDBFF'.codePointAt(0), 0xD800);
+assert.sameValue('\uD800\uE000'.codePointAt(0), 0xD800);
+
+assert.sameValue('\uDAAA\uDBFF'.codePointAt(0), 0xDAAA);
+assert.sameValue('\uDAAA\uE000'.codePointAt(0), 0xDAAA);
+
+assert.sameValue('\uDBFF\uDBFF'.codePointAt(0), 0xDBFF);
+assert.sameValue('\uDBFF\uE000'.codePointAt(0), 0xDBFF);
+
+assert.sameValue('\uD800\u0000'.codePointAt(0), 0xD800);
+assert.sameValue('\uD800\uFFFF'.codePointAt(0), 0xD800);
+
+assert.sameValue('\uDAAA\u0000'.codePointAt(0), 0xDAAA);
+assert.sameValue('\uDAAA\uFFFF'.codePointAt(0), 0xDAAA);
+
+assert.sameValue('\uDBFF\uDBFF'.codePointAt(0), 0xDBFF);
+assert.sameValue('\uDBFF\uFFFF'.codePointAt(0), 0xDBFF);
+
+reportCompare(0, 0);