Intl.ListFormat: Test the order of properties in the result of resolvedOptions().

test/intl402/ListFormat/prototype/resolvedOptions/order.js

@@ -0,0 +1,19 @@
+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.ListFormat.prototype.resolvedOptions
+description: Verifies the property order for the object returned by resolvedOptions().
+includes: [compareArray.js]
+features: [Intl.ListFormat]
+---*/
+
+const options = new Intl.ListFormat().resolvedOptions();
+
+const expected = [
+  "locale",
+  "type",
+  "style",
+];
+
+assert.compareArray(Object.getOwnPropertyNames(options), expected);