Test limits in PlainYearMonth.from.

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

@@ -0,0 +1,25 @@
+// 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.from
+description: PlainYearMonth.from enforces the supported range
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+["reject", "constrain"].forEach((overflow) => {
+  [{ year: -271821, month: 3 }, { year: 275760, month: 10 }, "-271821-03", "+275760-10"].forEach((value) => {
+    assert.throws(RangeError, () => Temporal.PlainYearMonth.from(value, { overflow }),
+      `${JSON.stringify(value)} with ${overflow}`);
+  });
+});
+
+TemporalHelpers.assertPlainYearMonth(Temporal.PlainYearMonth.from({ year: -271821, month: 4 }),
+  -271821, 4, "M04", "min object");
+TemporalHelpers.assertPlainYearMonth(Temporal.PlainYearMonth.from({ year: 275760, month: 9 }),
+  275760, 9, "M09", "max object");
+TemporalHelpers.assertPlainYearMonth(Temporal.PlainYearMonth.from("-271821-04"),
+  -271821, 4, "M04", "min string");
+TemporalHelpers.assertPlainYearMonth(Temporal.PlainYearMonth.from("+275760-09"),
+  275760, 9, "M09", "max string");