Lint the tests

Author: alessiostalla

tests/model/test_model.py

@@ -23,6 +23,7 @@ class SomeNode(Node, Named):
     def __post_init__(self):
         self.bar = 5
 
+
 @dataclasses.dataclass
 class ExtendedNode(SomeNode):
     prop = 2

tests/test_processing.py

@@ -1,6 +1,6 @@
 import unittest
 from dataclasses import dataclass
-from typing import List, Set
+from typing import List
 
 from pylasu.model import Node
 from tests.fixtures import box, Item