erased saving in pickle

hub/unittests/test_systems_factory.py

@@ -67,7 +67,6 @@ class TestSystemsFactory(TestCase):
       insel_path = (self._output_path / f'{building.name}.insel')
       subprocess.run(['insel', str(insel_path)])
     ResultFactory('insel_monthly_energy_balance', self._city, self._output_path).enrich()
-    self._city.save(self._output_path / 'city.pickle')
 
     for building in self._city.buildings:
       building.energy_systems_archetype_name = 'system 1 gas'