diff --git a/tests/ahocorapy_test.py b/tests/ahocorapy_test.py
index 6dcc8d9..f8d506f 100644
--- a/tests/ahocorapy_test.py
+++ b/tests/ahocorapy_test.py
@@ -294,6 +294,37 @@ def test_pickling_simple(self):
         self.assertEqual(('frodo', 20), next(results))
         self.assertEqual(('gandalf', 31), next(results))
 
+    def test_pickling_before_finalizing(self):
+        words = ['peter', 'horst', 'gandalf', 'frodo']
+        tree = KeywordTree(case_insensitive=True)
+        for word in words:
+            tree.add(word)
+        as_bytes = dumps(tree)
+
+        self.assertIsNotNone(as_bytes)
+
+        deserialized = loads(as_bytes)
+
+        self.assertIsNotNone(deserialized)
+
+        deserialized.finalize()
+
+        text = 'Gollum did not like frodo. But gandalf did.'
+
+        results = deserialized.search_all(text)
+
+        self.assertEqual(('frodo', 20), next(results))
+        self.assertEqual(('gandalf', 31), next(results))
+
+    def test_state_to_string(self):
+        words = ['peter', 'horst', 'gandalf', 'frodo']
+        tree = KeywordTree(case_insensitive=True)
+        for word in words:
+            tree.add(word)
+        tree.finalize()
+        as_string = str(tree._zero_state)
+        self.assertIsNotNone(as_string)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tox.ini b/tox.ini
index ea35eee..1388a61 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,3 +12,6 @@ deps =
   pytest-cov
   pytest-pep8
 usedevelop = True
+
+[pytest]
+pep8maxlinelength = 160