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diff --git a/parser/test_parser.py b/parser/test_parser.py
index 4f2e176..cf053b8 100755
--- a/parser/test_parser.py
+++ b/parser/test_parser.py
@@ -1,56 +1,82 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 import unittest
+from lark import LexError, ParseError
+from parser import parse
 
-class TestParser(unittest.TestCase):
-    def test_01_import(self):
-        global parser
-        from parser import parser
 
+class TestParser(unittest.TestCase):
     def _parse(self, input):
-        return parser.parse(input)
+        return parse(input)
 
     def test_02_tag(self):
         self.assertEqual(self._parse('xxx'), ('NAME', 'xxx'))
 
     def test_03_bad_tag(self):
-        from ply.lex import LexError
         self.assertRaises(LexError, self._parse, 'XXX')
 
     def test_04_expression(self):
-        self.assertEqual(self._parse('!(xxx&yyy)'),
+        self.assertEqual(
+            self._parse('!(xxx&yyy)'),
             ('NOT', ('PARENS', ('AND', ('NAME', 'xxx'), ('NAME', 'yyy'))))
         )
-        self.assertEqual(self._parse('!(xxx & yyy)'),
+        self.assertEqual(
+            self._parse('!(xxx & yyy)'),
             ('NOT', ('PARENS', ('AND', ('NAME', 'xxx'), ('NAME', 'yyy'))))
         )
-        self.assertEqual(self._parse('!xxx&yyy&zzz|ooo'),
-            ('OR', ('AND', ('AND', ('NOT', ('NAME', 'xxx')), ('NAME', 'yyy')), ('NAME', 'zzz')), ('NAME', 'ooo'))
+        self.assertEqual(
+            self._parse('!xxx&yyy&zzz|ooo'),
+            ('OR', ('AND',
+                    ('NOT', ('NAME', 'xxx')),
+                    ('AND', ('NAME', 'yyy'), ('NAME', 'zzz'))),
+                ('NAME', 'ooo'))
         )
-        self.assertEqual(self._parse('!(xxx &&  yyy)'),
+        self.assertEqual(
+            self._parse('!(xxx &&  yyy)'),
             ('NOT', ('PARENS', ('AND', ('NAME', 'xxx'), ('NAME', 'yyy'))))
         )
-        self.assertEqual(self._parse('!(xxx || yyy)'),
+        self.assertEqual(
+            self._parse('!(xxx || yyy)'),
             ('NOT', ('PARENS', ('OR', ('NAME', 'xxx'), ('NAME', 'yyy'))))
         )
-        self.assertEqual(self._parse('xxx and yyy'),
+        self.assertEqual(
+            self._parse('xxx and yyy'),
             ('AND', ('NAME', 'xxx'), ('NAME', 'yyy'))
         )
-        self.assertEqual(self._parse('xxx or  yyy'),
+        self.assertEqual(
+            self._parse('xxx or  yyy'),
             ('OR', ('NAME', 'xxx'), ('NAME', 'yyy'))
         )
-        self.assertEqual(self._parse('xxx OR yyy'),
+        self.assertEqual(
+            self._parse('xxx OR yyy'),
             ('OR', ('NAME', 'xxx'), ('NAME', 'yyy'))
         )
-        self.assertEqual(self._parse('not xxx'),
+        self.assertEqual(
+            self._parse('not xxx'),
             ('NOT', ('NAME', 'xxx'))
         )
-        self.assertEqual(self._parse('NOT xxx'),
+        self.assertEqual(
+            self._parse('NOT xxx'),
             ('NOT', ('NAME', 'xxx'))
         )
+        self.assertEqual(
+            self._parse('NOT (xxx & yyy) AND zzz | ooo'),
+            ('OR',
+                ('AND',
+                    ('NOT',
+                        ('PARENS',
+                            ('AND', ('NAME', 'xxx'), ('NAME', 'yyy'))
+                         )
+                     ),
+                    ('NAME', 'zzz')
+                 ),
+                ('NAME', 'ooo')
+             )
+        )
 
     def test_05_bad_expression(self):
-        self.assertIs(self._parse('!(xxx&yyy'), None)
+        self.assertRaises(ParseError, self._parse, '!(xxx&yyy')
+
 
 if __name__ == "__main__":
     unittest.main()