add more tests for T*.Calendar.p*.fields

test/built-ins/Temporal/Calendar/prototype/fields/reverse.js

@@ -0,0 +1,42 @@
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.fields
+description: >
+  Temporal.Calendar.prototype.fields will take iterable of any size and any string
+  and return Array of the same content.
+info: |
+  ## 12.4.21 Temporal.Calendar.prototype.fields ( fields )
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  4. Let iteratorRecord be ? Getiterator(fields, sync).
+  5. Let fieldNames be a new empty List.
+  6. Let next be true.
+  7. Repeat, while next is not false,
+  a. Set next to ? IteratorStep(iteratorRecord).
+  b. If next is not false, then
+  i. Let nextValue be ? IteratorValue(next).
+  iv. If nextValue is not one of "year", "month", "monthCode", "day", "hour", "minute", "second", "millisecond", "microsecond", "nanosecond", then
+  1. Let completion be ThrowCompletion(a newly created RangeError object).
+  2. Return ? IteratorClose(iteratorRecord, completion).
+features: [Symbol, Symbol.iterator, Temporal, computed-property-names, generators]
+includes: [compareArray.js]
+---*/
+let cal = new Temporal.Calendar("iso8601")
+const fields = {
+  *[Symbol.iterator]() {
+     yield "nanosecond";
+     yield "microsecond";
+     yield "millisecond";
+     yield "second";
+     yield "minute";
+     yield "hour";
+     yield "day";
+     yield "monthCode";
+     yield "month";
+     yield "year";
+  }
+}
+assert(compareArray(cal.fields(fields), Array.from(fields)),
+    'valid fields should return true even if they are in reversed order of the spec');