diff --git a/tests/messages/test_jslexer.py b/tests/messages/test_jslexer.py
index 35204eee0..dc43a71a7 100644
--- a/tests/messages/test_jslexer.py
+++ b/tests/messages/test_jslexer.py
@@ -4,6 +4,7 @@
 def test_unquote():
     assert jslexer.unquote_string('""') == ''
     assert jslexer.unquote_string(r'"h\u00ebllo"') == u"hëllo"
+    assert jslexer.unquote_string(r'"h\xebllo"') == u"hëllo"
 
 
 def test_dollar_in_identifier():