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diff --git a/js/src/tests/test262/intl402/Locale/constructor-options-numberingsystem-valid.js b/js/src/tests/test262/intl402/Locale/constructor-options-numberingsystem-valid.js
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+++ b/js/src/tests/test262/intl402/Locale/constructor-options-numberingsystem-valid.js
@@ -0,0 +1,63 @@
+// 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: >
+    Checks valid cases for the options argument to the Locale constructor.
+info: |
+    Intl.Locale( tag [, options] )
+
+    ...
+    27. Let numberingSystem be ? GetOption(options, "numberingSystem", "string", undefined, undefined).
+    ...
+    29. Set opt.[[nu]] to numberingSystem.
+    ...
+    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 validNumberingSystemOptions = [
+  ["abc", "en-u-nu-abc"],
+  ["abcd", "en-u-nu-abcd"],
+  ["abcde", "en-u-nu-abcde"],
+  ["abcdef", "en-u-nu-abcdef"],
+  ["abcdefg", "en-u-nu-abcdefg"],
+  ["abcdefgh", "en-u-nu-abcdefgh"],
+  ["12345678", "en-u-nu-12345678"],
+  ["1234abcd", "en-u-nu-1234abcd"],
+  ["1234abcd-abc123", "en-u-nu-1234abcd-abc123"],
+];
+for (const [numberingSystem, expected] of validNumberingSystemOptions) {
+  assert.sameValue(
+    new Intl.Locale('en', { numberingSystem }).toString(),
+    expected,
+    `new Intl.Locale("en", { numberingSystem: ${numberingSystem} }).toString() returns "${expected}"`
+  );
+  assert.sameValue(
+    new Intl.Locale('en-u-nu-latn', { numberingSystem }).toString(),
+    expected,
+    `new Intl.Locale("en-u-nu-latn", { numberingSystem: ${numberingSystem} }).toString() returns "${expected}"`
+  );
+}
+
+reportCompare(0, 0);