|  | @@ -769,17 +769,17 @@ class ServiceTest(DockerClientTestCase):
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				|  |  |          container = service.create_container(number=next_number, quiet=True)
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				|  |  |          container.start()
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				|  |  |  
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				|  |  | -        self.assertTrue(container.is_running)
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				|  |  | -        self.assertEqual(len(service.containers()), 1)
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				|  |  | +        container.inspect()
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				|  |  | +        assert container.is_running
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				|  |  | +        assert len(service.containers()) == 1
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				|  |  |  
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				|  |  |          service.scale(1)
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				|  |  | -
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				|  |  | -        self.assertEqual(len(service.containers()), 1)
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				|  |  | +        assert len(service.containers()) == 1
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				|  |  |          container.inspect()
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				|  |  | -        self.assertTrue(container.is_running)
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				|  |  | +        assert container.is_running
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				|  |  |  
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				|  |  |          captured_output = mock_log.info.call_args[0]
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				|  |  | -        self.assertIn('Desired container number already achieved', captured_output)
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				|  |  | +        assert 'Desired container number already achieved' in captured_output
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				|  |  |  
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				|  |  |      @mock.patch('compose.service.log')
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				|  |  |      def test_scale_with_custom_container_name_outputs_warning(self, mock_log):
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