1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthDayFromFields/overflow-undefined.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthDayFromFields/overflow-undefined.js
new file mode 100644
index 0000000000..a44b81623e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/monthDayFromFields/overflow-undefined.js
@@ -0,0 +1,28 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.monthdayfromfields
+description: Fallback value for overflow option
+info: |
+    sec-getoption step 3:
+      3. If _value_ is *undefined*, return _fallback_.
+    sec-temporal-totemporaloverflow step 1:
+      1. Return ? GetOption(_normalizedOptions_, *"overflow"*, « String », « *"constrain"*, *"reject"* », *"constrain"*).
+    sec-temporal-isomonthdayfromfields step 2:
+      2. Let _overflow_ be ? ToTemporalOverflow(_options_).
+    sec-temporal.calendar.prototype.monthdayfromfields step 6:
+      6. Let _result_ be ? ISOMonthDayFromFields(_fields_, _options_).
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = new Temporal.Calendar("iso8601");
+
+const explicit = calendar.monthDayFromFields({ year: 2000, month: 15, day: 2 }, { overflow: undefined });
+TemporalHelpers.assertPlainMonthDay(explicit, "M12", 2, "default overflow is constrain");
+const implicit = calendar.monthDayFromFields({ year: 2000, month: 15, day: 2 }, {});
+TemporalHelpers.assertPlainMonthDay(implicit, "M12", 2, "default overflow is constrain");
+
+reportCompare(0, 0);