1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/early-err-modifiers-should-not-case-fold-i.js b/js/src/tests/test262/built-ins/RegExp/early-err-modifiers-should-not-case-fold-i.js
new file mode 100644
index 0000000000..bbe8e845e2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/early-err-modifiers-should-not-case-fold-i.js
@@ -0,0 +1,19 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright (C) 2024 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Code points other than "i", "m", "s" should not be case folded to "i", "m", or "s" (regular expression flags)
+esid: sec-patterns-static-semantics-early-errors
+features: [regexp-modifiers]
+info: |
+    Atom :: ( ? RegularExpresisonFlags : Disjunction )
+    It is a Syntax Error if the source text matched by RegularExpressionFlags contains any code points other than "i", "m", "s", or if it contains the same code point more than once.
+
+---*/
+
+assert.throws(SyntaxError, function () {
+  RegExp("(?I:a)", "i");
+}, 'RegExp("(?I:a)", "i"): ');
+
+reportCompare(0, 0);