Add tests for overflow in PlainDate.from().

test/built-ins/Temporal/PlainDate/from/argument-object.js

@@ -11,3 +11,11 @@ features: [Temporal]
 const dateTimeFields = { year: 2019, month: 10, monthCode: "M10", day: 1, hour: 14, minute: 20, second: 36 };
 const plainDate = Temporal.PlainDate.from(dateTimeFields);
 TemporalHelpers.assertPlainDate(plainDate, 2019, 10, "M10", 1);
+
+const badFields = { year: 2019, month: 1, day: 32 };
+assert.throws(RangeError, () => Temporal.PlainDate.from(badFields, { overflow: "reject" }),
+  "bad fields with reject");
+TemporalHelpers.assertPlainDate(Temporal.PlainDate.from(badFields),
+  plainDate, 2019, 1, "M01", 31, "bad fields with missing overflow");
+TemporalHelpers.assertPlainDate(Temporal.PlainDate.from(badFields, { overflow: "constrain" }),
+  plainDate, 2019, 1, "M01", 31, "bad fields with constrain");

test/built-ins/Temporal/PlainDate/from/argument-string-invalid.js

@@ -0,0 +1,30 @@
+// 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: overflow property is extracted with ISO-invalid string argument.
+info: |
+    1. Perform ? ToTemporalOverflow(_options_).
+
+    1. If ! IsValidISODate(year, month, day) is false, throw a RangeError exception.
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const expected = [
+  "get overflow",
+  "get overflow.toString",
+  "call overflow.toString",
+];
+
+let actual = [];
+const object = {
+  get overflow() {
+    actual.push("get overflow");
+    return TemporalHelpers.toPrimitiveObserver(actual, "constrain", "overflow");
+  }
+};
+
+assert.throws(RangeError, () => Temporal.PlainDate.from("2020-13-34", object));
+assert.compareArray(actual, expected);

test/built-ins/Temporal/PlainDate/from/argument-string.js

@@ -5,9 +5,6 @@
 esid: sec-temporal.plaindate.from
 description: overflow property is extracted with string argument.
 info: |
-    1. If Type(_item_) is Object, then
-      1. ...
-      1. Return ? DateFromFields(_calendar_, _fields_, _options_).
     1. Perform ? ToTemporalOverflow(_options_).
 includes: [compareArray.js, temporalHelpers.js]
 features: [Temporal]

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

@@ -22,11 +22,20 @@ info: |
 features: [Temporal]
 ---*/
 
-const validValues = [
+const validItems = [
   new Temporal.PlainDate(2000, 5, 2),
   { year: 2000, month: 5, day: 2 },
   "2000-05-02",
 ];
-validValues.forEach((value) => {
+const invalidOverflow = [
-  assert.throws(RangeError, () => Temporal.PlainDate.from(value, { overflow: "other string" }));
+  "",
+  "other string",
+  "balance",
+  "CONSTRAIN",
+  "constra\u0131n",
+];
+validItems.forEach((item) => {
+  invalidOverflow.forEach((overflow) => {
+    assert.throws(RangeError, () => Temporal.PlainDate.from(item, { overflow }));
+  });
 });