TST: Fixes modelling test tearDown

tests/modelling/test_modelling_algo.py

@@ -105,6 +105,7 @@ class FFCAlgorithmTestCase(TestCase):
     @classmethod
     def tearDownClass(cls):
         del cls.env
+        cls.tempdir.cleanup()
 
     @classmethod
     def create_bar_reader(cls, tempdir):
@@ -151,10 +152,6 @@ class FFCAlgorithmTestCase(TestCase):
         writer.write(splits, mergers, dividends)
         return SQLiteAdjustmentReader(dbpath)
 
-    @classmethod
-    def tearDownClass(cls):
-        cls.tempdir.cleanup()
-
     def make_source(self):
         return Panel(self.raw_data).tz_localize('UTC', axis=1)