1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/since/argument-string-calendar-annotation-invalid-key.js b/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/since/argument-string-calendar-annotation-invalid-key.js
new file mode 100644
index 0000000000..5d0053cad5
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/ZonedDateTime/prototype/since/argument-string-calendar-annotation-invalid-key.js
@@ -0,0 +1,26 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2024 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.zoneddatetime.prototype.since
+description: Annotation keys are lowercase-only
+features: [Temporal]
+---*/
+
+const invalidStrings = [
+  ["1970-01-01T00:00[UTC][U-CA=iso8601]", "invalid capitalized key"],
+  ["1970-01-01T00:00[UTC][u-CA=iso8601]", "invalid partially-capitalized key"],
+  ["1970-01-01T00:00[UTC][FOO=bar]", "invalid capitalized unrecognized key"],
+];
+const timeZone = new Temporal.TimeZone("UTC");
+const instance = new Temporal.ZonedDateTime(0n, timeZone);
+invalidStrings.forEach(([arg, descr]) => {
+  assert.throws(
+    RangeError,
+    () => instance.since(arg),
+    `annotation keys must be lowercase: ${arg} - ${descr}`
+  );
+});
+
+reportCompare(0, 0);