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diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateUntil/calendar-temporal-object.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateUntil/calendar-temporal-object.js
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+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/dateUntil/calendar-temporal-object.js
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+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// 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.calendar.prototype.dateuntil
+description: Fast path for converting other Temporal objects to Temporal.Calendar by reading internal slots
+info: |
+    sec-temporal.calendar.prototype.dateuntil steps 4–5:
+      4. Set _one_ to ? ToTemporalDate(_one_).
+      5. Set _two_ to ? ToTemporalDate(_two_).
+    sec-temporal-totemporaldate step 2.c:
+      c. Let _calendar_ be ? GetTemporalCalendarWithISODefault(_item_).
+    sec-temporal-gettemporalcalendarwithisodefault step 2:
+      2. Return ? ToTemporalCalendarWithISODefault(_calendar_).
+    sec-temporal-totemporalcalendarwithisodefault step 2:
+      3. Return ? ToTemporalCalendar(_temporalCalendarLike_).
+    sec-temporal-totemporalcalendar step 1.a:
+      a. If _temporalCalendarLike_ has an [[InitializedTemporalDate]], [[InitializedTemporalDateTime]], [[InitializedTemporalMonthDay]], [[InitializedTemporalYearMonth]], or [[InitializedTemporalZonedDateTime]] internal slot, then
+        i. Return _temporalCalendarLike_.[[Calendar]].
+includes: [compareArray.js, temporalHelpers.js]
+features: [Temporal]
+---*/
+
+TemporalHelpers.checkToTemporalCalendarFastPath((temporalObject) => {
+  const calendar = new Temporal.Calendar("iso8601");
+  calendar.dateUntil(
+    { year: 2000, month: 5, day: 2, calendar: temporalObject },
+    { year: 2005, month: 6, day: 3, calendar: temporalObject },
+  );
+});
+
+reportCompare(0, 0);