[Intl] Add date-format/check-hc-option.js

Bug: v8:7482
Change-Id: Icd3383e350555907c01ec65d2620477973117ea3
Reviewed-on: https://chromium-review.googlesource.com/c/1368864
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58258}

test/intl/date-format/check-hc-option.js

@@ -0,0 +1,41 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+let invalid_hc = [
+  "invalid",
+  "abce",
+  "h10",
+  "h13",
+  "h22",
+  "h25",
+];
+
+// https://www.unicode.org/repos/cldr/tags/latest/common/bcp47/calendar.xml
+let valid_hc= [
+  "h11",
+  "h12",
+  "h23",
+  "h24",
+];
+
+let locales = [
+  "en",
+  "ar",
+];
+
+invalid_hc.forEach(function(hc) {
+  let df = new Intl.DateTimeFormat(["en-u-hc-" + hc + "-fo-obar"]);
+  assertEquals("en", df.resolvedOptions().locale);
+}
+);
+
+valid_hc.forEach(function(hc) {
+  locales.forEach(function(base) {
+    let l = base + "-u-hc-" + hc;
+    let df = new Intl.DateTimeFormat([l + "-fo-obar"]);
+    assertEquals(l, df.resolvedOptions().locale);
+  });
+}
+);