Add test for NoneType comparison

leval_tests/test_leval.py

@@ -1,5 +1,5 @@
 import time
-from types import SimpleNamespace, NoneType
+from types import SimpleNamespace
 
 import pytest
 
@@ -10,12 +10,13 @@
     NoSuchFunction,
     NoSuchValue,
     Timeout,
-    TooComplex, InvalidConstant,
+    TooComplex,
 )
 from leval.simple import simple_eval
 from leval.universe.default import EvaluationUniverse
 from leval.universe.weakly_typed import WeaklyTypedSimpleUniverse
 
+NoneType = type(None)
 values = {
     "foo": 7,
     "bar": 8,
@@ -104,12 +105,12 @@ def test_error(description, case, expected):
 @pytest.mark.parametrize(
     "kind, description, case, expected",
     (
-            [("good",) + case for case in success_cases]
-            + [
-                ("bad",) + case
-                for case in error_cases
-                if case[-1] not in (InvalidOperands, NoSuchValue, NoSuchFunction)
-            ]
+        [("good",) + case for case in success_cases]
+        + [
+            ("bad",) + case
+            for case in error_cases
+            if case[-1] not in (InvalidOperands, NoSuchValue, NoSuchFunction)
+        ]
     ),
 )
 def test_verify(kind, description, case, expected):
@@ -170,7 +171,7 @@ def test_allowed_container_types():
 
 @pytest.mark.parametrize(
     "cases",
-   [['sup == None', 'foo != None', 'never == None']],
+    [["sup == None", "foo != None", "never == None"]],
 )
 def test_none_type_comparison(cases):
     uni = WeaklyTypedSimpleUniverse(values=values, functions={})