Temporal: Add test case for rounding Duration relative to a ZonedDate…

…Time (#4306)

This is the test for the change in tc39/proposal-temporal#3036 and is a variation of the test from tc39/proposal-temporal#2814 .

test/intl402/Temporal/Duration/prototype/round/rounding-with-largestunit.js

@@ -0,0 +1,22 @@
+// Copyright (C) 2024 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-temporal.duration.prototype.round
+description: Rounding mode is taken into account when largestUnit is present.
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+// Based on a test case by Adam Shaw
+
+const dur = new Temporal.Duration.from(0, 0, 0, 0, /* hours = */ 13, 0, 0, 0, 0, 0);
+const zdt = new Temporal.ZonedDateTime(0n, "UTC");
+
+TemporalHelpers.assertDuration(
+    dur.round({
+        relativeTo: zdt,
+        largestUnit: 'hours',
+        smallestUnit: 'hours',
+        roundingIncrement: 12,
+        roundingMode: 'ceil'
+    }), 0, 0, 0, 0, 24, 0, 0, 0, 0, 0);