update lexer test

Author: cmtice

llvm/utils/lit/tests/unit/ShUtil.py

@@ -28,6 +28,8 @@ def test_quoting(self):
         self.assertEqual(self.lex(""" a\\ b a\\\\b """), ["a b", "a\\b"])
         self.assertEqual(self.lex(""" "" "" """), ["", ""])
         self.assertEqual(self.lex(""" a\\ b """, win32Escapes=True), ["a\\", "b"])
+        self.assertEqual(self.lex("\"\\$y = 11\""), ["$y = 11"])
+        self.assertEqual(self.lex("\"expr \\$y = 11\""), ["expr $y = 11"])
 
 class TestShParse(unittest.TestCase):
     def parse(self, str):