Test PlainDate#{add,subtract}.

test/built-ins/Temporal/PlainDate/prototype/add/argument-invalid-duration.js

@@ -0,0 +1,16 @@
+// 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.prototype.add
+description: RangeError thrown when signs don't match in the duration
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarThrowEverything();
+const date = new Temporal.PlainDate(2000, 5, 2, calendar);
+const duration = { months: 1, days: -30 };
+for (const overflow of ["constrain", "reject"]) {
+  assert.throws(RangeError, () => date.add(duration, { overflow }));
+}

test/built-ins/Temporal/PlainDate/prototype/add/argument-missing-properties.js

@@ -0,0 +1,18 @@
+// 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.prototype.add
+description: TypeError for missing properties
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const date = new Temporal.PlainDate(2000, 5, 2);
+const options = {
+  get overflow() {
+    TemporalHelpers.assertUnreachable("should not get overflow");
+  }
+};
+assert.throws(TypeError, () => date.add({}, options), "empty object");
+assert.throws(TypeError, () => date.add({ month: 12 }, options), "misspelled 'months'");

test/built-ins/Temporal/PlainDate/prototype/add/overflow-invalid-string.js

@@ -18,4 +18,6 @@ features: [Temporal]
 
 const date = new Temporal.PlainDate(2000, 5, 2);
 const duration = new Temporal.Duration(3, 3, 0, 3);
-assert.throws(RangeError, () => date.add(duration, { overflow: "other string" }));
+for (const overflow of ["", "CONSTRAIN", "balance", "other string", "constra\u0131n"]) {
+  assert.throws(RangeError, () => date.add(duration, { overflow }));
+}

test/built-ins/Temporal/PlainDate/prototype/add/overflow-undefined.js

@@ -24,3 +24,5 @@ const explicit = date.add(duration, { overflow: undefined });
 TemporalHelpers.assertPlainDate(explicit, 2003, 6, "M06", 30, "default overflow is constrain");
 const implicit = date.add(duration, {});
 TemporalHelpers.assertPlainDate(implicit, 2003, 6, "M06", 30, "default overflow is constrain");
+const lambda = date.add(duration, () => {});
+TemporalHelpers.assertPlainDate(lambda, 2003, 6, "M06", 30, "default overflow is constrain");

test/built-ins/Temporal/PlainDate/prototype/subtract/argument-invalid-duration.js

@@ -0,0 +1,16 @@
+// 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.prototype.subtract
+description: RangeError thrown when signs don't match in the duration
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarThrowEverything();
+const date = new Temporal.PlainDate(2000, 5, 2, calendar);
+const duration = { months: 1, days: -30 };
+for (const overflow of ["constrain", "reject"]) {
+  assert.throws(RangeError, () => date.subtract(duration, { overflow }));
+}

test/built-ins/Temporal/PlainDate/prototype/subtract/argument-missing-properties.js

@@ -0,0 +1,18 @@
+// 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.prototype.subtract
+description: TypeError for missing properties
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const date = new Temporal.PlainDate(2000, 5, 2);
+const options = {
+  get overflow() {
+    TemporalHelpers.assertUnreachable("should not get overflow");
+  }
+};
+assert.throws(TypeError, () => date.subtract({}, options), "empty object");
+assert.throws(TypeError, () => date.subtract({ month: 12 }, options), "misspelled 'months'");

test/built-ins/Temporal/PlainDate/prototype/subtract/overflow-invalid-string.js

@@ -18,4 +18,6 @@ features: [Temporal]
 
 const date = new Temporal.PlainDate(2000, 5, 2);
 const duration = new Temporal.Duration(3, 3, 0, 3);
-assert.throws(RangeError, () => date.subtract(duration, { overflow: "other string" }));
+for (const overflow of ["", "CONSTRAIN", "balance", "other string", "constra\u0131n"]) {
+  assert.throws(RangeError, () => date.subtract(duration, { overflow }));
+}

test/built-ins/Temporal/PlainDate/prototype/subtract/overflow-undefined.js

@@ -24,3 +24,5 @@ const explicit = date.subtract(duration, { overflow: undefined });
 TemporalHelpers.assertPlainDate(explicit, 1997, 4, "M04", 30, "default overflow is constrain");
 const implicit = date.subtract(duration, {});
 TemporalHelpers.assertPlainDate(implicit, 1997, 4, "M04", 30, "default overflow is constrain");
+const lambda = date.subtract(duration, {});
+TemporalHelpers.assertPlainDate(lambda, 1997, 4, "M04", 30, "default overflow is constrain");