1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/test262/prs/3994/built-ins/Uint8Array/fromBase64/illegal-characters.js b/js/src/tests/test262/prs/3994/built-ins/Uint8Array/fromBase64/illegal-characters.js
new file mode 100644
index 0000000000..6c2d6eef4a
--- /dev/null
+++ b/js/src/tests/test262/prs/3994/built-ins/Uint8Array/fromBase64/illegal-characters.js
@@ -0,0 +1,26 @@
+// |reftest| shell-option(--enable-uint8array-base64) skip-if(!Uint8Array.fromBase64||!xulRuntime.shell) -- uint8array-base64 is not enabled unconditionally, requires shell-options
+// Copyright (C) 2024 Kevin Gibbons. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-uint8array.frombase64
+description: Uint8Array.fromBase64 throws a SyntaxError when input has non-base64, non-ascii-whitespace characters
+features: [uint8array-base64, TypedArray]
+---*/
+
+var illegal = [
+  'Zm.9v',
+  'Zm9v^',
+  'Zg==&',
+  'Z−==', // U+2212 'Minus Sign'
+  'Z＋==', // U+FF0B 'Fullwidth Plus Sign'
+  'Zg\u00A0==', // nbsp
+  'Zg\u2009==', // thin space
+  'Zg\u2028==', // line separator
+];
+illegal.forEach(function(value) {
+  assert.throws(SyntaxError, function() {
+    Uint8Array.fromBase64(value)
+  });
+});
+
+reportCompare(0, 0);