1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/Locale/subclassing.js b/js/src/tests/test262/intl402/Locale/subclassing.js
new file mode 100644
index 0000000000..4afc3a5a83
--- /dev/null
+++ b/js/src/tests/test262/intl402/Locale/subclassing.js
@@ -0,0 +1,28 @@
+// 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 that Locale can be subclassed.
+info: |
+    Intl.Locale( tag [, options] )
+
+    6. Let locale be ? OrdinaryCreateFromConstructor(NewTarget, %LocalePrototype%, internalSlotsList).
+
+features: [Intl.Locale]
+---*/
+
+class CustomLocale extends Intl.Locale {
+  constructor(locales, options) {
+    super(locales, options);
+    this.isCustom = true;
+  }
+}
+
+var locale = new CustomLocale("de");
+assert.sameValue(locale.isCustom, true, "Custom property");
+assert.sameValue(locale.toString(), "de", "Direct call");
+assert.sameValue(Intl.Locale.prototype.toString.call(locale), "de", "Indirect call");
+assert.sameValue(Object.getPrototypeOf(locale), CustomLocale.prototype, "Prototype");
+
+reportCompare(0, 0);