1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/leap-second.js b/js/src/tests/test262/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/leap-second.js
new file mode 100644
index 0000000000..a7eccfdb9b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/TimeZone/prototype/getOffsetStringFor/leap-second.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-temporal.timezone.prototype.getoffsetstringfor
+description: Leap second is a valid ISO string for Instant
+features: [Temporal]
+---*/
+
+const instance = new Temporal.TimeZone("UTC");
+
+const arg = "2016-12-31T23:59:60Z";
+const result = instance.getOffsetStringFor(arg);
+assert.sameValue(
+  result,
+  "+00:00",
+  "leap second is a valid ISO string for Instant"
+);
+
+reportCompare(0, 0);