1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/tests/test262/staging/Intl402/Temporal/old/yearmonth-toLocaleString.js b/js/src/tests/test262/staging/Intl402/Temporal/old/yearmonth-toLocaleString.js
new file mode 100644
index 0000000000..c92aa506d5
--- /dev/null
+++ b/js/src/tests/test262/staging/Intl402/Temporal/old/yearmonth-toLocaleString.js
@@ -0,0 +1,42 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2018 Bloomberg LP. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal-intl
+description: yearmonth.toLocaleString()
+features: [Temporal]
+---*/
+
+// Tolerate implementation variance by expecting consistency without being prescriptive.
+// TODO: can we change tests to be less reliant on CLDR formats while still testing that
+// Temporal and Intl are behaving as expected?
+// Workarounds for https://unicode-org.atlassian.net/browse/CLDR-16243
+const deMonthDayRangeSeparator = new Intl.DateTimeFormat("de-AT", { month: "numeric", day: "numeric" })
+  .formatRangeToParts(1 * 86400 * 1000, 90 * 86400 * 1000)
+  .find((part) => part.type === "literal" && part.source === "shared").value;
+const deMonthYearSeparator = new Intl.DateTimeFormat("de-AT", { year: "numeric", month: "numeric" })
+  .formatToParts(0)
+  .find((part) => part.type === "literal").value;
+
+var calendar = new Intl.DateTimeFormat("en-US").resolvedOptions().calendar;
+var yearmonth = Temporal.PlainYearMonth.from({
+  year: 1976,
+  month: 11,
+  calendar
+});
+assert.sameValue(`${yearmonth.toLocaleString("en-US", { timeZone: "America/New_York" })}`, "11/1976");
+assert.sameValue(
+  `${yearmonth.toLocaleString("de-AT", { timeZone: "Europe/Vienna", calendar })}`,
+  `11${deMonthYearSeparator}1976`
+);
+
+// should ignore units not in the data type
+assert.sameValue(yearmonth.toLocaleString("en-US", { timeZoneName: "long" }), "11/1976");
+assert.sameValue(yearmonth.toLocaleString("en-US", { day: "numeric" }), "11/1976");
+assert.sameValue(yearmonth.toLocaleString("en-US", { hour: "numeric" }), "11/1976");
+assert.sameValue(yearmonth.toLocaleString("en-US", { minute: "numeric" }), "11/1976");
+assert.sameValue(yearmonth.toLocaleString("en-US", { second: "numeric" }), "11/1976");
+assert.sameValue(yearmonth.toLocaleString("en-US", { weekday: "long" }), "11/1976");
+
+reportCompare(0, 0);