1 files changed, 68 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthDayFromFields/overflow-constrain.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthDayFromFields/overflow-constrain.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthDayFromFields/overflow-constrain.js
@@ -0,0 +1,68 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// 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.monthdayfromfields
+description: Temporal.Calendar.prototype.monthDayFromFields will return correctly with data and overflow set to 'constrain'.
+info: |
+  1. Let calendar be the this value.
+  2. Perform ? RequireInternalSlot(calendar, [[InitializedTemporalCalendar]]).
+  3. Assert: calendar.[[Identifier]] is "iso8601".
+  4. If Type(fields) is not Object, throw a TypeError exception.
+  5. Set options to ? GetOptionsObject(options).
+  6. Set fields to ? PrepareTemporalFields(fields, « "day", "month", "monthCode", "year" », « "day" »).
+  7. Let overflow be ? ToTemporalOverflow(options).
+  8. Perform ? ISOResolveMonth(fields).
+  9. Let result be ? ISOMonthDayFromFields(fields, overflow).
+  10. Return ? CreateTemporalMonthDay(result.[[Month]], result.[[Day]], "iso8601", result.[[ReferenceISOYear]]).
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const cal = new Temporal.Calendar("iso8601");
+const opt = { overflow: "constrain" };
+
+let result = cal.monthDayFromFields({ year: 2021, month: 13, day: 1 }, opt);
+TemporalHelpers.assertPlainMonthDay(result, "M12", 1, "month 13 is constrained to 12");
+
+result = cal.monthDayFromFields({ year: 2021, month: 999999, day: 500 }, opt);
+TemporalHelpers.assertPlainMonthDay(result, "M12", 31, "month 999999 is constrained to 12 and day 500 is constrained to 31");
+
+[-99999, -1, 0].forEach((month) => {
+  assert.throws(
+    RangeError,
+    () => cal.monthDayFromFields({ year: 2021, month, day: 1 }, opt),
+    `Month ${month} is out of range for 2021 even with overflow: constrain`
+  );
+});
+
+TemporalHelpers.ISOMonths.forEach(({ month, monthCode, daysInMonth }) => {
+  const day = daysInMonth + 1;
+
+  result = cal.monthDayFromFields({ month, day }, opt);
+  TemporalHelpers.assertPlainMonthDay(result, monthCode, daysInMonth,
+    `day is constrained from ${day} to ${daysInMonth} in month ${month}`);
+
+  result = cal.monthDayFromFields({ month, day: 9001 }, opt);
+  TemporalHelpers.assertPlainMonthDay(result, monthCode, daysInMonth,
+    `day is constrained to ${daysInMonth} in month ${month}`);
+
+  result = cal.monthDayFromFields({ monthCode, day }, opt);
+  TemporalHelpers.assertPlainMonthDay(result, monthCode, daysInMonth,
+    `day is constrained from ${day} to ${daysInMonth} in monthCode ${monthCode}`);
+
+  result = cal.monthDayFromFields({ monthCode, day: 9001 }, opt);
+  TemporalHelpers.assertPlainMonthDay(result, monthCode, daysInMonth,
+    `day is constrained to ${daysInMonth} in monthCode ${monthCode}`);
+});
+
+[ ["month", 2], ["monthCode", "M02"] ].forEach(([ name, value ]) => {
+  result = cal.monthDayFromFields({ year: 2020, [name]: value, day: 30 }, opt);
+  TemporalHelpers.assertPlainMonthDay(result, "M02", 29, `${name} ${value} is constrained to 29 in leap year 2020`);
+
+  result = cal.monthDayFromFields({ year: 2021, [name]: value, day: 29 }, opt);
+  TemporalHelpers.assertPlainMonthDay(result, "M02", 28, `${name} ${value} is constrained to 28 in common year 2021`);
+});
+
+reportCompare(0, 0);