Temporal: Change overflow behaviour of PYM/PMD.toPlainDate

These tests cover the proposed normative change: tc39/proposal-temporal#2706
tc39 · Dec 4, 2023 · 6cbb6da · 6cbb6da
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diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/basic.js b/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/basic.js
@@ -15,7 +15,6 @@ TemporalHelpers.assertPlainDate(d, 2002, 1, "M01", 22);
 assert.throws(TypeError, () => md.toPlainDate({ something: 'nothing' }), "missing fields");
 
 const leapDay = Temporal.PlainMonthDay.from('02-29');
-assert.throws(RangeError, () => leapDay.toPlainDate({ year: 2019 }));
 TemporalHelpers.assertPlainDate(leapDay.toPlainDate({ year: 2020 }), 2020, 2, "M02", 29);
 
 const options = {

diff --git a/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/default-overflow-behaviour.js b/test/built-ins/Temporal/PlainMonthDay/prototype/toPlainDate/default-overflow-behaviour.js
@@ -0,0 +1,14 @@
+// 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.plainmonthday.prototype.toplaindate
+description: A nonexistent resulting date is constrained to an existing date
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const leapDay = new Temporal.PlainMonthDay(2, 29);
+const result = leapDay.toPlainDate({ year: 2023 });
+// 2023-02-29 does not exist because 2023 is a common year
+TemporalHelpers.assertPlainDate(result, 2023, 2, "M02", 28, "2023 + 02-29 = 2023-02-28");
diff --git a/test/built-ins/Temporal/PlainYearMonth/prototype/toPlainDate/default-overflow-behaviour.js b/test/built-ins/Temporal/PlainYearMonth/prototype/toPlainDate/default-overflow-behaviour.js
@@ -0,0 +1,19 @@
+// 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.plainyearmonth.prototype.toplaindate
+description: A nonexistent resulting date is constrained to an existing date
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const febCommonYear = new Temporal.PlainYearMonth(2023, 2);
+const result = febCommonYear.toPlainDate({ day: 29 });
+// 2023-02-29 does not exist because 2023 is a common year
+TemporalHelpers.assertPlainDate(result, 2023, 2, "M02", 28, "2023-02 + 29 = 2023-02-28");
+
+const juneAnyYear = new Temporal.PlainYearMonth(1998, 6);
+const result2 = juneAnyYear.toPlainDate({ day: 31 });
+// 06-31 does not exist in any year
+TemporalHelpers.assertPlainDate(result2, 1998, 6, "M06", 30, "1998-06 + 31 = 1998-06-31");