1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Temporal/PlainDateTime/prototype/since/largestunit-invalid-string.js b/js/src/tests/test262/built-ins/Temporal/PlainDateTime/prototype/since/largestunit-invalid-string.js
new file mode 100644
index 0000000000..e67796f959
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Temporal/PlainDateTime/prototype/since/largestunit-invalid-string.js
@@ -0,0 +1,31 @@
+// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-temporal.plaindatetime.prototype.since
+description: RangeError thrown when largestUnit option not one of the allowed string values
+features: [Temporal]
+---*/
+
+const earlier = new Temporal.PlainDateTime(2000, 5, 2, 12, 34, 56, 0, 0, 0);
+const later = new Temporal.PlainDateTime(2001, 6, 3, 13, 35, 57, 987, 654, 321);
+const badValues = [
+  "era",
+  "eraYear",
+  "millisecond\0",
+  "mill\u0131second",
+  "SECOND",
+  "eras",
+  "eraYears",
+  "milliseconds\0",
+  "mill\u0131seconds",
+  "SECONDS",
+  "other string"
+];
+for (const largestUnit of badValues) {
+  assert.throws(RangeError, () => later.since(earlier, { largestUnit }),
+    `"${largestUnit}" is not a valid value for largestUnit`);
+}
+
+reportCompare(0, 0);