1 files changed, 16 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/proto-in-calendar-fields.js b/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/proto-in-calendar-fields.js
new file mode 100644
index 0000000000..37da40afa8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/toPlainMonthDay/proto-in-calendar-fields.js
@@ -0,0 +1,16 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-temporal.zoneddatetime.prototype.toplainmonthday
+description: If a calendar's fields() method returns a field named '__proto__', PrepareTemporalFields should throw a RangeError.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const calendar = TemporalHelpers.calendarWithExtraFields(['__proto__']);
+const zoneddatetime = new Temporal.ZonedDateTime(1682892000000000000n, 'Europe/Madrid', calendar);
+
+assert.throws(RangeError, () => zoneddatetime.toPlainMonthDay());
+
+reportCompare(0, 0);