Temporal: Add tests that subclass constructors work.

test/built-ins/Temporal/Calendar/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar
+description: Test for Temporal.Calendar subclassing.
+flags: [Temporal]
+---*/
+
+class CustomCalendar extends Temporal.Calendar {
+}
+
+const instance = new CustomCalendar("iso8601");
+assert.sameValue(instance.toString(), "iso8601");
+assert.sameValue(Object.getPrototypeOf(instance), CustomCalendar.prototype, "Instance of CustomCalendar");
+assert(instance instanceof CustomCalendar, "Instance of CustomCalendar");
+assert(instance instanceof Temporal.Calendar, "Instance of Temporal.Calendar");

test/built-ins/Temporal/Duration/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.duration
+description: Test for Temporal.Duration subclassing.
+includes: [temporalHelpers.js]
+flags: [Temporal]
+---*/
+
+class CustomDuration extends Temporal.Duration {
+}
+
+const instance = new CustomDuration(1, 1, 0, 1);
+TemporalHelpers.assertDuration(instance, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0);
+assert.sameValue(Object.getPrototypeOf(instance), CustomDuration.prototype, "Instance of CustomDuration");
+assert(instance instanceof CustomDuration, "Instance of CustomDuration");
+assert(instance instanceof Temporal.Duration, "Instance of Temporal.Duration");

test/built-ins/Temporal/Instant/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.instant
+description: Test for Temporal.Instant subclassing.
+flags: [Temporal]
+---*/
+
+class CustomInstant extends Temporal.Instant {
+}
+
+const instance = new CustomInstant(0n);
+assert.sameValue(instance.epochNanoseconds, 0n);
+assert.sameValue(Object.getPrototypeOf(instance), CustomInstant.prototype, "Instance of CustomInstant");
+assert(instance instanceof CustomInstant, "Instance of CustomInstant");
+assert(instance instanceof Temporal.Instant, "Instance of Temporal.Instant");

test/built-ins/Temporal/PlainDate/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindate
+description: Test for Temporal.PlainDate subclassing.
+includes: [temporalHelpers.js]
+flags: [Temporal]
+---*/
+
+class CustomPlainDate extends Temporal.PlainDate {
+}
+
+const instance = new CustomPlainDate(2000, 5, 2);
+TemporalHelpers.assertPlainDate(instance, 2000, 5, "M05", 2);
+assert.sameValue(Object.getPrototypeOf(instance), CustomPlainDate.prototype, "Instance of CustomPlainDate");
+assert(instance instanceof CustomPlainDate, "Instance of CustomPlainDate");
+assert(instance instanceof Temporal.PlainDate, "Instance of Temporal.PlainDate");

test/built-ins/Temporal/PlainDateTime/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime
+description: Test for Temporal.PlainDateTime subclassing.
+includes: [temporalHelpers.js]
+flags: [Temporal]
+---*/
+
+class CustomPlainDateTime extends Temporal.PlainDateTime {
+}
+
+const instance = new CustomPlainDateTime(2000, 5, 2, 12, 34, 56, 987, 654, 321);
+TemporalHelpers.assertPlainDateTime(instance, 2000, 5, "M05", 2, 12, 34, 56, 987, 654, 321);
+assert.sameValue(Object.getPrototypeOf(instance), CustomPlainDateTime.prototype, "Instance of CustomPlainDateTime");
+assert(instance instanceof CustomPlainDateTime, "Instance of CustomPlainDateTime");
+assert(instance instanceof Temporal.PlainDateTime, "Instance of Temporal.PlainDateTime");

test/built-ins/Temporal/PlainMonthDay/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainmonthday
+description: Test for Temporal.PlainMonthDay subclassing.
+includes: [temporalHelpers.js]
+flags: [Temporal]
+---*/
+
+class CustomPlainMonthDay extends Temporal.PlainMonthDay {
+}
+
+const instance = new CustomPlainMonthDay(5, 2);
+TemporalHelpers.assertPlainMonthDay(instance, "M05", 2);
+assert.sameValue(Object.getPrototypeOf(instance), CustomPlainMonthDay.prototype, "Instance of CustomPlainMonthDay");
+assert(instance instanceof CustomPlainMonthDay, "Instance of CustomPlainMonthDay");
+assert(instance instanceof Temporal.PlainMonthDay, "Instance of Temporal.PlainMonthDay");

test/built-ins/Temporal/PlainTime/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaintime
+description: Test for Temporal.PlainTime subclassing.
+includes: [temporalHelpers.js]
+flags: [Temporal]
+---*/
+
+class CustomPlainTime extends Temporal.PlainTime {
+}
+
+const instance = new CustomPlainTime(12, 34, 56, 987, 654, 321);
+TemporalHelpers.assertPlainTime(instance, 12, 34, 56, 987, 654, 321);
+assert.sameValue(Object.getPrototypeOf(instance), CustomPlainTime.prototype, "Instance of CustomPlainTime");
+assert(instance instanceof CustomPlainTime, "Instance of CustomPlainTime");
+assert(instance instanceof Temporal.PlainTime, "Instance of Temporal.PlainTime");

test/built-ins/Temporal/PlainYearMonth/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plainyearmonth
+description: Test for Temporal.PlainYearMonth subclassing.
+includes: [temporalHelpers.js]
+flags: [Temporal]
+---*/
+
+class CustomPlainYearMonth extends Temporal.PlainYearMonth {
+}
+
+const instance = new CustomPlainYearMonth(2000, 5);
+TemporalHelpers.assertPlainYearMonth(instance, 2000, 5, "M05");
+assert.sameValue(Object.getPrototypeOf(instance), CustomPlainYearMonth.prototype, "Instance of CustomPlainYearMonth");
+assert(instance instanceof CustomPlainYearMonth, "Instance of CustomPlainYearMonth");
+assert(instance instanceof Temporal.PlainYearMonth, "Instance of Temporal.PlainYearMonth");

test/built-ins/Temporal/TimeZone/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.timezone
+description: Test for Temporal.TimeZone subclassing.
+flags: [Temporal]
+---*/
+
+class CustomTimeZone extends Temporal.TimeZone {
+}
+
+const instance = new CustomTimeZone("UTC");
+assert.sameValue(instance.toString(), "UTC");
+assert.sameValue(Object.getPrototypeOf(instance), CustomTimeZone.prototype, "Instance of CustomTimeZone");
+assert(instance instanceof CustomTimeZone, "Instance of CustomTimeZone");
+assert(instance instanceof Temporal.TimeZone, "Instance of Temporal.TimeZone");

test/built-ins/Temporal/ZonedDateTime/subclass.js

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+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime
+description: Test for Temporal.ZonedDateTime subclassing.
+flags: [Temporal]
+---*/
+
+class CustomZonedDateTime extends Temporal.ZonedDateTime {
+}
+
+const instance = new CustomZonedDateTime(0n, "UTC");
+assert.sameValue(instance.epochNanoseconds, 0n);
+assert.sameValue(Object.getPrototypeOf(instance), CustomZonedDateTime.prototype, "Instance of CustomZonedDateTime");
+assert(instance instanceof CustomZonedDateTime, "Instance of CustomZonedDateTime");
+assert(instance instanceof Temporal.ZonedDateTime, "Instance of Temporal.ZonedDateTime");