1 files changed, 45 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/DateTimeFormat/prototype/formatRange/en-US.js b/js/src/tests/test262/intl402/DateTimeFormat/prototype/formatRange/en-US.js
new file mode 100644
index 0000000000..756b9f8f35
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+++ b/js/src/tests/test262/intl402/DateTimeFormat/prototype/formatRange/en-US.js
@@ -0,0 +1,45 @@
+// Copyright (C) 2019 the V8 project authors, Igalia S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-partitiondatetimerangepattern
+description: Basic tests for the en-US output of formatRange()
+info: |
+  Intl.DateTimeFormat.prototype.formatRange ( startDate , endDate )
+
+  8. Return ? FormatDateTimeRange(dtf, x, y).
+locale: [en-US]
+features: [Intl.DateTimeFormat-formatRange]
+---*/
+
+// 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?
+const usDateRangeSeparator = new Intl.DateTimeFormat("en-US", { dateStyle: "short" })
+  .formatRangeToParts(1 * 86400 * 1000, 366 * 86400 * 1000)
+  .find((part) => part.type === "literal" && part.source === "shared").value;
+
+const date1 = new Date("2019-01-03T00:00:00");
+const date2 = new Date("2019-01-05T00:00:00");
+const date3 = new Date("2019-03-04T00:00:00");
+const date4 = new Date("2020-03-04T00:00:00");
+
+let dtf = new Intl.DateTimeFormat("en-US");
+assert.sameValue(dtf.formatRange(date1, date1), "1/3/2019");
+assert.sameValue(dtf.formatRange(date1, date2), `1/3/2019${usDateRangeSeparator}1/5/2019`);
+assert.sameValue(dtf.formatRange(date1, date3), `1/3/2019${usDateRangeSeparator}3/4/2019`);
+assert.sameValue(dtf.formatRange(date1, date4), `1/3/2019${usDateRangeSeparator}3/4/2020`);
+assert.sameValue(dtf.formatRange(date2, date3), `1/5/2019${usDateRangeSeparator}3/4/2019`);
+assert.sameValue(dtf.formatRange(date2, date4), `1/5/2019${usDateRangeSeparator}3/4/2020`);
+assert.sameValue(dtf.formatRange(date3, date4), `3/4/2019${usDateRangeSeparator}3/4/2020`);
+
+dtf = new Intl.DateTimeFormat("en-US", {year: "numeric", month: "short", day: "numeric"});
+assert.sameValue(dtf.formatRange(date1, date1), "Jan 3, 2019");
+assert.sameValue(dtf.formatRange(date1, date2), `Jan 3${usDateRangeSeparator}5, 2019`);
+assert.sameValue(dtf.formatRange(date1, date3), `Jan 3${usDateRangeSeparator}Mar 4, 2019`);
+assert.sameValue(dtf.formatRange(date1, date4), `Jan 3, 2019${usDateRangeSeparator}Mar 4, 2020`);
+assert.sameValue(dtf.formatRange(date2, date3), `Jan 5${usDateRangeSeparator}Mar 4, 2019`);
+assert.sameValue(dtf.formatRange(date2, date4), `Jan 5, 2019${usDateRangeSeparator}Mar 4, 2020`);
+assert.sameValue(dtf.formatRange(date3, date4), `Mar 4, 2019${usDateRangeSeparator}Mar 4, 2020`);
+
+reportCompare(0, 0);