fix unit test

test/unit/test_passes.py

@@ -67,12 +67,12 @@ def test_string_builtins(self):
         # only do each once even if there are multiple -O2 operations.
         passes = self.get_passes_run(['-O2', '-O2', '-all'])
         self.assertEqual(passes.count('string-lifting'), 1)
-        self.assertEqual(passes.count('string-lowering'), 1)
+        self.assertEqual(passes.count('string-lowering-magic-imports'), 1)
 
         # Other passes appear twice, when -O2 is repeated
         self.assertEqual(passes.count('directize'), 2)
 
         # Without the feature, we do not lift or lower.
         passes = self.get_passes_run(['-O2', '-O2', '-all', '--disable-string-builtins'])
         self.assertEqual(passes.count('string-lifting'), 0)
-        self.assertEqual(passes.count('string-lowering'), 0)
+        self.assertEqual(passes.count('string-lowering-magic-imports'), 0)