1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/yearMonthFromFields/reference-day.js b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/yearMonthFromFields/reference-day.js
new file mode 100644
index 0000000000..5c1157cda8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/Calendar/prototype/yearMonthFromFields/reference-day.js
@@ -0,0 +1,41 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.calendar.prototype.yearmonthfromfields
+description: Reference ISO day is chosen to be the first of the calendar month
+info: |
+  6.d. Perform ! CreateDataPropertyOrThrow(_fields_, *"day"*, *1*<sub>𝔽</sub>).
+    e. Let _result_ be ? CalendarDateToISO(_calendar_.[[Identifier]], _fields_, _options_).
+includes: [temporalHelpers.js]
+features: [Temporal]
+---*/
+
+const cal = new Temporal.Calendar("iso8601");
+
+const result1 = cal.yearMonthFromFields({ year: 2023, monthCode: "M01", day: 13 });
+TemporalHelpers.assertPlainYearMonth(
+  result1,
+  2023, 1, "M01",
+  "reference day is 1 even if day is given",
+  /* era = */ undefined, /* era year = */ undefined, /* reference day = */ 1
+);
+
+const result2 = cal.yearMonthFromFields({ year: 2021, monthCode: "M02", day: 50 }, { overflow: "constrain" });
+TemporalHelpers.assertPlainYearMonth(
+  result2,
+  2021, 2, "M02",
+  "reference day is 1 even if day is out of range (overflow constrain)",
+  /* era = */ undefined, /* era year = */ undefined, /* reference day = */ 1
+);
+
+const result3 = cal.yearMonthFromFields({ year: 2021, monthCode: "M02", day: 50 }, { overflow: "reject" });
+TemporalHelpers.assertPlainYearMonth(
+  result3,
+  2021, 2, "M02",
+  "reference day is 1 even if day is out of range (overflow reject)",
+  /* era = */ undefined, /* era year = */ undefined, /* reference day = */ 1
+);
+
+reportCompare(0, 0);