1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/unicode_character_class_backspace_escape.js b/js/src/tests/test262/built-ins/RegExp/unicode_character_class_backspace_escape.js
new file mode 100644
index 0000000000..aefd40fcb3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/unicode_character_class_backspace_escape.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: prod-ClassEscapes
+description: >
+  \b escape inside CharacterClass is valid in Unicode patterns (unlike \B).
+info: |
+  ClassEscape[U] ::
+    b
+
+  Static Semantics: CharacterValue
+
+  ClassEscape :: b
+
+  1. Return the code point value of U+0008 (BACKSPACE).
+---*/
+
+assert(/[\b]/u.test('\u0008'));
+assert(/[\b-A]/u.test('A'));
+
+reportCompare(0, 0);