Return non zero code on failure

tests/test_code.py

@@ -9,9 +9,8 @@ class TestCode(unittest.TestCase):
 
         with open("tests/ressources/outils/remove_comments_wo.nf", 'r') as f:
             code_wo_comments = f.read()
-
         code = Code(code_with_comments, origin=None)
         self.assertEqual(code.code, '\n'+code_with_comments+'\n')
-        self.assertEqual(code.code_wo_comments, '\n'+code_wo_comments+'\n')
+        self.assertEqual(code.code_wo_comments.strip(), code_wo_comments.strip())
         self.assertEqual(code.get_code(), code_wo_comments.strip())