Add test to ensure Intl.DateTimeFormat choose pattern by calendar (#2381)

* Add test for different pattern based on calendar

* Add test for formatRangeToParts

* remove  debug print

* fix typo

* fix typo

* address review feedback

* address review feedback

* change the map and use string template

* rewrite maps and use string template

test/intl402/DateTimeFormat/prototype/formatRangeToParts/pattern-on-calendar.js

@@ -0,0 +1,53 @@
+// Copyright 2019 Google Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-initializedatetimeformat
+description: Checks the DateTimeFormat choose different patterns based
+    on calendar.
+locale: [en]
+---*/
+
+let calendars = [
+  "buddhist",
+  "chinese",
+  "coptic",
+  "dangi",
+  "ethiopic",
+  "ethioaa",
+  "gregory",
+  "hebrew",
+  "indian",
+  "islamic",
+  "islamic-civil",
+  "islamic-rgsa",
+  "islamic-tbla",
+  "islamic-umalqura",
+  "japanese",
+  "persian",
+  "roc"
+];
+let date1 = new Date(2017, 3, 12);
+let date2 = new Date();
+
+// serialize parts to a string by considering only the type and literal.
+function serializeTypesAndLiteral(parts) {
+  let types = parts.map(part => {
+    if (part.type == "literal") {
+      return `${part.type}(${part.value})`;
+    }
+    return part.type;
+  });
+  return types.join(":");
+}
+
+let df = new Intl.DateTimeFormat("en");
+let base  = serializeTypesAndLiteral(df.formatRangeToParts(date1, date2));
+
+const foundDifferentPattern = calendars.some(function(calendar) {
+  let cdf = new Intl.DateTimeFormat("en-u-ca-" + calendar);
+  return base != serializeTypesAndLiteral(cdf.formatRangeToParts(date1, date2));
+});
+
+// Expect at least some calendar use different pattern.
+assert.sameValue(foundDifferentPattern, true);

test/intl402/DateTimeFormat/prototype/formatToParts/pattern-on-calendar.js

@@ -0,0 +1,52 @@
+// Copyright 2019 Google Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-initializedatetimeformat
+description: Checks the DateTimeFormat choose different patterns based
+    on calendar.
+locale: [en]
+---*/
+
+let calendars = [
+  "buddhist",
+  "chinese",
+  "coptic",
+  "dangi",
+  "ethiopic",
+  "ethioaa",
+  "gregory",
+  "hebrew",
+  "indian",
+  "islamic",
+  "islamic-civil",
+  "islamic-rgsa",
+  "islamic-tbla",
+  "islamic-umalqura",
+  "japanese",
+  "persian",
+  "roc"
+];
+let date = new Date();
+
+// serialize parts to a string by considering only the type and literal.
+function serializeTypesAndLiteral(parts) {
+  let types = parts.map(part => {
+    if (part.type == "literal") {
+      return `${part.type}(${part.value})`;
+    }
+    return part.type;
+  });
+  return types.join(":");
+}
+
+let df = new Intl.DateTimeFormat("en");
+let base  = serializeTypesAndLiteral(df.formatToParts(date));
+
+const foundDifferentPattern = calendars.some(function(calendar) {
+  let cdf = new Intl.DateTimeFormat("en-u-ca-" + calendar);
+  return base != serializeTypesAndLiteral(cdf.formatToParts(date));
+});
+
+// Expect at least some calendar use different pattern.
+assert.sameValue(foundDifferentPattern, true);