Temporal: Add additional tests for TimeClip in DateTimeFormat methods

Same test as tc39#4940, but for the
formatRange/formatToParts/formatRangeToParts methods. I noticed in my
polyfill implementation that it's possible to pass the tests in tc39#4940
while still implementing the other methods incorrectly.

Author: ptomato

test/intl402/DateTimeFormat/prototype/formatRange/temporal-objects-no-time-clip.js

@@ -0,0 +1,53 @@
+// Copyright (C) 2026 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-partitiondatetimerangepattern
+description: TimeClip is not applied for Temporal plain objects.
+info: |
+  PartitionDateTimeRangePattern ( _dateTimeFormat_, _x_, _y_ )
+    2. Let _xFormatRecord_ be ? ValueFormatRecord(_dateTimeFormat_, _x_).
+    3. Let _yFormatRecord_ be ? ValueFormatRecord(_dateTimeFormat_, _y_).
+features: [Temporal]
+locale: [en]
+---*/
+
+// Based on the test in
+// DateTime/prototype/format/temporal-objects-no-time-clip.js by André Bargull.
+
+// Test with Temporal default calendar "iso8601" and additionally "gregory".
+var calendars = ["iso8601", "gregory"];
+
+for (var calendar of calendars) {
+  var dtf = new Intl.DateTimeFormat("en", {calendar});
+
+  // Minimum and maximum PlainDate values
+  var minDate = new Temporal.PlainDate(-271821, 4, 19, calendar);
+  var maxDate = new Temporal.PlainDate(275760, 9, 13, calendar);
+  var dateResult = dtf.formatRange(minDate, maxDate);
+  assert(dateResult.includes("-271821") || dateResult.includes("271822"), "dateResult includes min year");
+  assert(dateResult.includes("4"), "dateResult includes min month");
+  assert(dateResult.includes("19"), "dateResult includes min day");
+  assert(dateResult.includes("275760"), "dateResult includes max year");
+  // no point in asserting it includes month "9", since it already includes "19"
+  assert(dateResult.includes("13"), "result includes max day");
+
+  // Minimum and maximum PlainDateTime values
+  var minDateTime = new Temporal.PlainDateTime(-271821, 4, 19, 0, 0, 0, 0, 0, 1, calendar);
+  var maxDateTime = new Temporal.PlainDateTime(275760, 9, 13, 23, 59, 59, 999, 999, 999, calendar);
+  var dateTimeResult = dtf.formatRange(minDateTime, maxDateTime);
+  assert(dateTimeResult.includes("-271821") || dateTimeResult.includes("271822"), "dateTimeResult includes min year");
+  assert(dateTimeResult.includes("4"), "dateTimeResult includes min month");
+  assert(dateTimeResult.includes("19"), "dateTimeResult includes min day");
+  assert(dateTimeResult.includes("275760"), "dateTimeResult includes max year");
+  assert(dateTimeResult.includes("13"), "dateTimeResult includes max day");
+
+  // Minimum and maximum PlainYearMonth values
+  var minYearMonth = new Temporal.PlainYearMonth(-271821, 4, calendar);
+  var maxYearMonth = new Temporal.PlainYearMonth(275760, 9, calendar);
+  var yearMonthResult = dtf.formatRange(minYearMonth, maxYearMonth);
+  assert(yearMonthResult.includes("-271821") || yearMonthResult.includes("271822"), "yearMonthResult includes min year");
+  assert(yearMonthResult.includes("4"), "yearMonthResult includes min month");
+  assert(yearMonthResult.includes("275760"), "yearMonthResult includes max year");
+  assert(yearMonthResult.includes("9"), "yearMonthResult includes max month");
+}

test/intl402/DateTimeFormat/prototype/formatRangeToParts/temporal-objects-no-time-clip.js

@@ -0,0 +1,61 @@
+// Copyright (C) 2026 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-partitiondatetimerangepattern
+description: TimeClip is not applied for Temporal plain objects.
+info: |
+  PartitionDateTimeRangePattern ( _dateTimeFormat_, _x_, _y_ )
+    2. Let _xFormatRecord_ be ? ValueFormatRecord(_dateTimeFormat_, _x_).
+    3. Let _yFormatRecord_ be ? ValueFormatRecord(_dateTimeFormat_, _y_).
+features: [Temporal]
+locale: [en]
+---*/
+
+// Based on the test in
+// DateTime/prototype/format/temporal-objects-no-time-clip.js by André Bargull.
+
+function findPart(parts, expectedType, expectedSource) {
+  return parts.find(({ type, source }) => type === expectedType && source === expectedSource).value;
+}
+
+// Test with Temporal default calendar "iso8601" and additionally "gregory".
+var calendars = ["iso8601", "gregory"];
+
+for (var calendar of calendars) {
+  var dtf = new Intl.DateTimeFormat("en", {calendar});
+
+  // Minimum and maximum PlainDate values
+  var minDate = new Temporal.PlainDate(-271821, 4, 19, calendar);
+  var maxDate = new Temporal.PlainDate(275760, 9, 13, calendar);
+  var dateParts = dtf.formatRangeToParts(minDate, maxDate);
+  var yearPart = +findPart(dateParts, "year", "startRange");
+  assert(yearPart === -271821 || yearPart === 271822, "dateParts includes min year");
+  assert.sameValue(+findPart(dateParts, "month", "startRange"), 4, "dateParts includes min month");
+  assert.sameValue(+findPart(dateParts, "day", "startRange"), 19, "dateParts includes min day");
+  assert.sameValue(+findPart(dateParts, "year", "endRange"), 275760, "dateParts includes max year");
+  assert.sameValue(+findPart(dateParts, "month", "endRange"), 9, "dateParts includes max month");
+  assert.sameValue(+findPart(dateParts, "day", "endRange"), 13, "dateParts includes max day");
+
+  // Minimum and maximum PlainDateTime values
+  var minDateTime = new Temporal.PlainDateTime(-271821, 4, 19, 0, 0, 0, 0, 0, 1, calendar);
+  var maxDateTime = new Temporal.PlainDateTime(275760, 9, 13, 23, 59, 59, 999, 999, 999, calendar);
+  var dateTimeParts = dtf.formatRangeToParts(minDateTime, maxDateTime);
+  yearPart = +findPart(dateTimeParts, "year", "startRange");
+  assert(yearPart === -271821 || yearPart === 271822, "dateTimeParts includes min year");
+  assert.sameValue(+findPart(dateTimeParts, "month", "startRange"), 4, "dateTimeParts includes min month");
+  assert.sameValue(+findPart(dateTimeParts, "day", "startRange"), 19, "dateTimeParts includes min day");
+  assert.sameValue(+findPart(dateTimeParts, "year", "endRange"), 275760, "dateTimeParts includes max year");
+  assert.sameValue(+findPart(dateTimeParts, "month", "endRange"), 9, "dateTimeParts includes max month");
+  assert.sameValue(+findPart(dateTimeParts, "day", "endRange"), 13, "dateTimeParts includes max day");
+
+  // Minimum and maximum PlainYearMonth values
+  var minYearMonth = new Temporal.PlainYearMonth(-271821, 4, calendar);
+  var maxYearMonth = new Temporal.PlainYearMonth(275760, 9, calendar);
+  var yearMonthParts = dtf.formatRangeToParts(minYearMonth, maxYearMonth);
+  yearPart = +findPart(yearMonthParts, "year", "startRange");
+  assert(yearPart === -271821 || yearPart === 271822, "yearMonthParts includes min year");
+  assert.sameValue(+findPart(yearMonthParts, "month", "startRange"), 4, "yearMonthParts includes min month");
+  assert.sameValue(+findPart(yearMonthParts, "year", "endRange"), 275760, "yearMonthParts includes max year");
+  assert.sameValue(+findPart(yearMonthParts, "month", "endRange"), 9, "yearMonthParts includes max month");
+}

test/intl402/DateTimeFormat/prototype/formatToParts/temporal-objects-no-time-clip.js

@@ -0,0 +1,63 @@
+// Copyright (C) 2026 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-partitiondatetimepattern
+description: TimeClip is not applied for Temporal plain objects.
+info: |
+  PartitionDateTimePattern ( _dateTimeFormat_, _x_ )
+    1. Let _formatRecord_ be ? ValueFormatRecord(_dateTimeFormat_, _x_).
+features: [Temporal]
+locale: [en]
+---*/
+
+// Based on the test in
+// DateTime/prototype/format/temporal-objects-no-time-clip.js by André Bargull.
+
+function findPart(parts, expectedType) {
+  return parts.find(({ type }) => type === expectedType).value;
+}
+
+// Test with Temporal default calendar "iso8601" and additionally "gregory".
+var calendars = ["iso8601", "gregory"];
+
+for (var calendar of calendars) {
+  var dtf = new Intl.DateTimeFormat("en", {calendar});
+
+  // Minimum plain date value.
+  var minDate = dtf.formatToParts(new Temporal.PlainDate(-271821, 4, 19, calendar));
+  let yearPart = +findPart(minDate, "year");
+  assert(yearPart === -271821 || yearPart === 271822, "minDate includes year");
+  assert.sameValue(+findPart(minDate, "month"), 4, "minDate includes month");
+  assert.sameValue(+findPart(minDate, "day"), 19, "minDate includes day");
+
+  // Maximum plain date value.
+  var maxDate = dtf.formatToParts(new Temporal.PlainDate(275760, 9, 13, calendar));
+  assert.sameValue(+findPart(maxDate, "year"), 275760, "maxDate includes year");
+  assert.sameValue(+findPart(maxDate, "month"), 9, "maxDate includes month");
+  assert.sameValue(+findPart(maxDate, "day"), 13, "maxDate includes day");
+
+  // Minimum plain date-time value.
+  var minDateTime = dtf.formatToParts(new Temporal.PlainDateTime(-271821, 4, 19, 0, 0, 0, 0, 0, 1, calendar));
+  yearPart = +findPart(minDateTime, "year");
+  assert(yearPart === -271821 || yearPart === 271822, "minDateTime includes year");
+  assert.sameValue(+findPart(minDateTime, "month"), 4, "minDateTime includes month");
+  assert.sameValue(+findPart(minDateTime, "day"), 19, "minDateTime includes day");
+
+  // Maximum plain date-time value.
+  var maxDateTime = dtf.formatToParts(new Temporal.PlainDateTime(275760, 9, 13, 23, 59, 59, 999, 999, 999, calendar));
+  assert.sameValue(+findPart(maxDateTime, "year"), 275760, "maxDateTime includes year");
+  assert.sameValue(+findPart(maxDateTime, "month"), 9, "maxDateTime includes month");
+  assert.sameValue(+findPart(maxDateTime, "day"), 13, "maxDateTime includes day");
+
+  // Minimum plain year-month value.
+  var minYearMonth = dtf.formatToParts(new Temporal.PlainYearMonth(-271821, 4, calendar));
+  yearPart = +findPart(minYearMonth, "year");
+  assert(yearPart === -271821 || yearPart === 271822, "minYearMonth includes year");
+  assert.sameValue(+findPart(minYearMonth, "month"), 4, "minYearMonth includes month");
+
+  // Maximum plain year-month value.
+  var maxYearMonth = dtf.formatToParts(new Temporal.PlainYearMonth(275760, 9, calendar));
+  assert.sameValue(+findPart(maxYearMonth, "year"), 275760, "maxYearMonth includes year");
+  assert.sameValue(+findPart(maxYearMonth, "month"), 9, "maxYearMonth includes month");
+}