1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/basic.js b/js/src/tests/test262/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/basic.js
new file mode 100644
index 0000000000..1a39263196
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/PlainYearMonth/prototype/daysInMonth/basic.js
@@ -0,0 +1,21 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-get-temporal.plainyearmonth.prototype.daysinmonth
+description: daysInMonth works
+features: [Temporal]
+---*/
+
+const tests = [
+  [new Temporal.PlainYearMonth(1976, 2), 29],
+  [new Temporal.PlainYearMonth(1976, 11), 30],
+  [new Temporal.PlainYearMonth(1976, 12), 31],
+  [new Temporal.PlainYearMonth(1977, 2), 28],
+];
+for (const [plainYearMonth, expected] of tests) {
+  assert.sameValue(plainYearMonth.daysInMonth, expected, `${expected} days in the month of ${plainYearMonth}`);
+}
+
+reportCompare(0, 0);