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diff --git a/js/src/tests/test262/built-ins/String/prototype/toLowerCase/Final_Sigma_U180E.js b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/Final_Sigma_U180E.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/String/prototype/toLowerCase/Final_Sigma_U180E.js
@@ -0,0 +1,62 @@
+// Copyright (C) 2016 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-string.prototype.tolowercase
+description: >
+    Check if String.prototype.toLowerCase supports conditional mappings defined in SpecialCasings,
+    test Final_Sigma context with Mongolian Vowel Separator
+info: |
+    The result must be derived according to the locale-insensitive case mappings in the Unicode Character
+    Database (this explicitly includes not only the UnicodeData.txt file, but also all locale-insensitive
+    mappings in the SpecialCasings.txt file that accompanies it).
+features: [u180e]
+---*/
+
+// SpecialCasing.txt, conditional, language-insensitive mappings.
+
+// <code>; <lower>; <title>; <upper>; (<condition_list>;)? # <comment>
+// 03A3; 03C2; 03A3; 03A3; Final_Sigma; # GREEK CAPITAL LETTER SIGMA
+// 03A3; 03C3; 03A3; 03A3; # GREEK CAPITAL LETTER SIGMA
+
+// Final_Sigma is defined in Unicode 8.0, 3.13 Default Case Algorithms
+// General_Category of Mongolian Vowel Separator is Cf (Format), characters in Cf are Case_Ignorable.
+
+
+// Sigma preceded by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u180E\u03A3".toLowerCase(),
+  "a\u180E\u03C2",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u180E\u03A3B".toLowerCase(),
+  "a\u180E\u03C3b",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by LATIN CAPITAL LETTER B"
+);
+
+// Sigma followed by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u03A3\u180E".toLowerCase(),
+  "a\u03C2\u180E",
+  "Sigma preceded by LATIN CAPITAL LETTER A, followed by MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u03A3\u180EB".toLowerCase(),
+  "a\u03C3\u180Eb",
+  "Sigma preceded by LATIN CAPITAL LETTER A, followed by MONGOLIAN VOWEL SEPARATOR, LATIN CAPITAL LETTER B"
+);
+
+// Sigma preceded and followed by Mongolian Vowel Separator.
+assert.sameValue(
+  "A\u180E\u03A3\u180E".toLowerCase(),
+  "a\u180E\u03C2\u180E",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by MONGOLIAN VOWEL SEPARATOR"
+);
+assert.sameValue(
+  "A\u180E\u03A3\u180EB".toLowerCase(),
+  "a\u180E\u03C3\u180Eb",
+  "Sigma preceded by LATIN CAPITAL LETTER A, MONGOLIAN VOWEL SEPARATOR, followed by MONGOLIAN VOWEL SEPARATOR, LATIN CAPITAL LETTER B"
+);
+
+reportCompare(0, 0);