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diff --git a/js/src/tests/test262/intl402/Locale/constructor-options-numeric-undefined.js b/js/src/tests/test262/intl402/Locale/constructor-options-numeric-undefined.js
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+++ b/js/src/tests/test262/intl402/Locale/constructor-options-numeric-undefined.js
@@ -0,0 +1,56 @@
+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.locale
+description: Verifies the behavior of an undefined numeric option to the Locale constructor.
+info: |
+    Intl.Locale( tag [, options] )
+
+    ...
+    24. Let kn be ? GetOption(options, "numeric", "boolean", undefined, undefined).
+    25. If kn is not undefined, set kn to ! ToString(kn).
+    ...
+    30. Let r be ! ApplyUnicodeExtensionToTag(tag, opt, relevantExtensionKeys).
+    ...
+
+    ApplyUnicodeExtensionToTag( tag, options, relevantExtensionKeys )
+
+    ...
+    8. Let locale be the String value that is tag with all Unicode locale extension sequences removed.
+    9. Let newExtension be ! CanonicalizeUnicodeExtension(attributes, keywords).
+    10. If newExtension is not the empty String, then
+        a. Let locale be ! InsertUnicodeExtension(locale, newExtension).
+    ...
+
+    CanonicalizeUnicodeExtension( attributes, keywords )
+    ...
+    4. Repeat for each element entry of keywords in List order,
+        a. Let keyword be entry.[[Key]].
+        b. If entry.[[Value]] is not the empty String, then
+            i. Let keyword be the string-concatenation of keyword, "-", and entry.[[Value]].
+        c. Append keyword to fullKeywords.
+    ...
+features: [Intl.Locale]
+---*/
+
+const options = { numeric: undefined };
+assert.sameValue(
+  new Intl.Locale('en', options).toString(),
+  "en",
+  'new Intl.Locale("en", {numeric: undefined}).toString() returns "en"'
+);
+
+assert.sameValue(
+  new Intl.Locale('en-u-kn-true', options).toString(),
+  "en-u-kn",
+  'new Intl.Locale("en-u-kn-true", {numeric: undefined}).toString() returns "en-u-kn"'
+);
+
+assert.sameValue(
+  new Intl.Locale('en-u-kf-lower', options).numeric,
+  false,
+  'The value of new Intl.Locale("en-u-kf-lower", {numeric: undefined}).numeric equals `false`'
+);
+
+reportCompare(0, 0);