Temporal: Add test coverage for large roundingIncrement in ZDT math

In ZonedDateTime.p.since/until, it's possible for AddDateTime to hit the
limit if the rounding increment is very high, even if the resulting
rounded duration isn't outside of the limit. Add a test covering this
case.

test/built-ins/Temporal/ZonedDateTime/prototype/since/roundingincrement-addition-out-of-range.js

@@ -0,0 +1,48 @@
+// 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.zoneddatetime.prototype.since
+description: >
+  RangeError thrown when the value of roundingIncrement puts the ending bound
+  out of range during the rounding operation
+info: |
+    NudgeToCalendarUnit ( sign, duration, destEpochNs, dateTime, calendarRec,
+      timeZoneRec, increment, unit, roundingMode )
+
+    6. Let _end_ be ? AddDateTime(_dateTime_.[[Year]], _dateTime_.[[Month]],
+      _dateTime_.[[Day]], _dateTime_.[[Hour]], _dateTime_.[[Minute]],
+      _dateTime_.[[Second]], _dateTime_.[[Millisecond]],
+      _dateTime_.[[Microsecond]], _dateTime_.[[Nanosecond]], _calendarRec_,
+      _endDuration_.[[Years]], _endDuration_.[[Months]],
+      _endDuration_.[[Weeks]], _endDuration_.[[Days]],
+      _endDuration_.[[NormalizedTime]], *undefined*).
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = new Temporal.ZonedDateTime(0n, "UTC");
+const later = new Temporal.ZonedDateTime(5n, "UTC");
+
+assert.throws(
+  RangeError,
+  () => later.since(earlier, { smallestUnit: "days", roundingIncrement: 1e8 + 1 }),
+  "ending bound of 1e8 + 1 days is out of range when added to 1970-01-01"
+);
+assert.throws(
+  RangeError,
+  () => earlier.since(later, { smallestUnit: "days", roundingIncrement: 1e8 + 1 }),
+  "ending bound of -1e8 - 1 days is out of range when added to 1970-01-01"
+);
+
+{
+  const result = later.since(earlier, { smallestUnit: "days", roundingIncrement: 1e8, roundingMode: "expand" });
+  TemporalHelpers.assertDuration(result, 0, 0, 0, 1e8, 0, 0, 0, 0, 0, 0,
+    "ending bound of 1e8 days is not out of range when added to 1970-01-01");
+}
+
+{
+  const result = earlier.since(later, { smallestUnit: "days", roundingIncrement: 1e8, roundingMode: "expand" });
+  TemporalHelpers.assertDuration(result, 0, 0, 0, -1e8, 0, 0, 0, 0, 0, 0,
+    "ending bound of -1e8 days is not out of range when added to 1970-01-01");
+}

test/built-ins/Temporal/ZonedDateTime/prototype/until/roundingincrement-addition-out-of-range.js

@@ -0,0 +1,48 @@
+// 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.zoneddatetime.prototype.until
+description: >
+  RangeError thrown when the value of roundingIncrement puts the ending bound
+  out of range during the rounding operation
+info: |
+    NudgeToCalendarUnit ( sign, duration, destEpochNs, dateTime, calendarRec,
+      timeZoneRec, increment, unit, roundingMode )
+
+    6. Let _end_ be ? AddDateTime(_dateTime_.[[Year]], _dateTime_.[[Month]],
+      _dateTime_.[[Day]], _dateTime_.[[Hour]], _dateTime_.[[Minute]],
+      _dateTime_.[[Second]], _dateTime_.[[Millisecond]],
+      _dateTime_.[[Microsecond]], _dateTime_.[[Nanosecond]], _calendarRec_,
+      _endDuration_.[[Years]], _endDuration_.[[Months]],
+      _endDuration_.[[Weeks]], _endDuration_.[[Days]],
+      _endDuration_.[[NormalizedTime]], *undefined*).
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const earlier = new Temporal.ZonedDateTime(0n, "UTC");
+const later = new Temporal.ZonedDateTime(5n, "UTC");
+
+assert.throws(
+  RangeError,
+  () => earlier.until(later, { smallestUnit: "days", roundingIncrement: 1e8 + 1 }),
+  "ending bound of 1e8 + 1 days is out of range when added to 1970-01-01"
+);
+assert.throws(
+  RangeError,
+  () => later.until(earlier, { smallestUnit: "days", roundingIncrement: 1e8 + 1 }),
+  "ending bound of -1e8 - 1 days is out of range when added to 1970-01-01"
+);
+
+{
+  const result = earlier.until(later, { smallestUnit: "days", roundingIncrement: 1e8, roundingMode: "expand" });
+  TemporalHelpers.assertDuration(result, 0, 0, 0, 1e8, 0, 0, 0, 0, 0, 0,
+    "ending bound of 1e8 days is not out of range when added to 1970-01-01");
+}
+
+{
+  const result = later.until(earlier, { smallestUnit: "days", roundingIncrement: 1e8, roundingMode: "expand" });
+  TemporalHelpers.assertDuration(result, 0, 0, 0, -1e8, 0, 0, 0, 0, 0, 0,
+    "ending bound of -1e8 days is not out of range when added to 1970-01-01");
+}