fix

Author: dflook

test/test_folding.py

@@ -337,16 +337,36 @@ def test_not_false_in_conditional():
     """
     Test that 'not False' is folded to 'True' in a conditional.
     """
+    if sys.version_info < (3, 4):
+        pytest.skip('NameConstant not in python < 3.4')
+
     run_test('if not False:pass', 'if True:pass')
 
 
 def test_not_not_true_in_assignment():
     """
     Test that 'not not True' is folded to 'True' in an assignment.
     """
+    if sys.version_info < (3, 4):
+        pytest.skip('NameConstant not in python < 3.4')
+
     run_test('x=not not True', 'x=True')
 
 
+def test_bool_not_folded_before_34():
+    """
+    Test that boolean 'not' expressions are not folded in Python < 3.4.
+
+    NameConstant was introduced in Python 3.4, so we cannot fold boolean
+    constants in earlier versions.
+    """
+    if sys.version_info >= (3, 4):
+        pytest.skip('Only applies to python < 3.4')
+
+    run_test('if not False:pass', 'if not False:pass')
+    run_test('x=not not True', 'x=not not True')
+
+
 def test_constant_folding_enabled_by_default():
     """Verify constant folding is enabled by default."""
     source = 'x = 10 + 10'