Add tests for limits in PlainDate.

test/built-ins/Temporal/PlainDate/from/limits.js

@@ -0,0 +1,28 @@
+// 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.plaindate.from
+description: PlainDate.from enforces the supported range
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const tooEarly = { year: -271821, month: 4, day: 18 };
+const tooLate = { year: 275760, month: 9, day: 14 };
+["reject", "constrain"].forEach((overflow) => {
+  [tooEarly, tooLate, "-271821-04-18", "+275760-09-14"].forEach((value) => {
+    assert.throws(RangeError, () => Temporal.PlainDate.from(value, { overflow }),
+      `${JSON.stringify(value)} with ${overflow}`);
+  });
+});
+
+TemporalHelpers.assertPlainDate(Temporal.PlainDate.from({ year: -271821, month: 4, day: 19 }),
+  -271821, 4, "M04", 19, "min object");
+TemporalHelpers.assertPlainDate(Temporal.PlainDate.from({ year: 275760, month: 9, day: 13 }),
+  275760, 9, "M09", 13, "max object");
+
+TemporalHelpers.assertPlainDate(Temporal.PlainDate.from("-271821-04-19"),
+  -271821, 4, "M04", 19, "min string");
+TemporalHelpers.assertPlainDate(Temporal.PlainDate.from("+275760-09-13"),
+  275760, 9, "M09", 13, "max string");

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

@@ -0,0 +1,16 @@
+// 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.plaindate
+description: Limits for the PlainDate constructor.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+assert.throws(RangeError, () => new Temporal.PlainDate(-271821, 4, 18), "min");
+assert.throws(RangeError, () => new Temporal.PlainDate(275760, 9, 14), "max");
+TemporalHelpers.assertPlainDate(new Temporal.PlainDate(-271821, 4, 19),
+  -271821, 4, "M04", 19, "min");
+TemporalHelpers.assertPlainDate(new Temporal.PlainDate(275760, 9, 13),
+  275760, 9, "M09", 13, "max");

test/built-ins/Temporal/PlainDate/prototype/add/limits.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Temporal.PlainDate.prototype.add throws a RangeError if the calculation crosses a limit
+esid: sec-temporal.plaindate.prototype.add
+features: [Temporal]
+---*/
+
+const min = Temporal.PlainDate.from("-271821-04-19");
+const max = Temporal.PlainDate.from("+275760-09-13");
+["reject", "constrain"].forEach((overflow) => {
+  assert.throws(RangeError, () => min.add({ days: -1 }, { overflow }), `min with ${overflow}`);
+  assert.throws(RangeError, () => max.add({ days: 1 }, { overflow }), `max with ${overflow}`);
+});

test/built-ins/Temporal/PlainDate/prototype/subtract/limits.js

@@ -0,0 +1,15 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Temporal.PlainDate.prototype.subtract throws a RangeError if the calculation crosses a limit
+esid: sec-temporal.plaindate.prototype.subtract
+features: [Temporal]
+---*/
+
+const min = Temporal.PlainDate.from("-271821-04-19");
+const max = Temporal.PlainDate.from("+275760-09-13");
+["reject", "constrain"].forEach((overflow) => {
+  assert.throws(RangeError, () => min.subtract({ days: 1 }, { overflow }), `min with ${overflow}`);
+  assert.throws(RangeError, () => max.subtract({ days: -1 }, { overflow }), `max with ${overflow}`);
+});