Adapt test to use a number

because SOURCE_DATE_EPOCH is supposed to be numeric
and random.seed takes a number.

Author: bmwiedemann

kiwi/system/identifier.py

@@ -39,7 +39,7 @@ def __init__(self):
         sde = os.environ.get('SOURCE_DATE_EPOCH')
         if sde:
             log.info('Using SOURCE_DATE_EPOCH as random seed.')
-            random.seed(sde)
+            random.seed(int(sde))
 
     def get_id(self) -> str:
         """

test/unit/system/identifier_test.py

@@ -8,9 +8,9 @@
 class TestSystemIdentifier:
     @patch('random.seed')
     def setup(self, mock_random_seed):
-        with patch.dict('os.environ', {'SOURCE_DATE_EPOCH': 'some'}):
+        with patch.dict('os.environ', {'SOURCE_DATE_EPOCH': '123456'}):
             self.identifier = SystemIdentifier()
-        mock_random_seed.assert_called_once_with('some')
+        mock_random_seed.assert_called_once_with(123456)
 
     @patch('random.seed')
     def setup_method(self, cls, mock_random_seed):