Apply suggestion to test/test_compressor.py

test/test_compressor.py

@@ -12,7 +12,6 @@ class CompressorTest(unittest.TestCase):
         """Load a json to use as testdata."""
         with open("soitool/testdata/codebook.json", "r") as file:
             self.soi = json.load(file)
-        file.close()
 
     def test_compress(self):
         """Test compression returns ascii and reduces size."""