def test_customizations(self):
        """
        Customizing ProgressHelper should be possible
        """
        progress = ProgressHelper()
        progress.set_bar_width(10)
        progress.set_bar_character('_')
        progress.set_empty_bar_character(' ')
        progress.set_progress_character('/')
        progress.set_display_format(' %current%/%max% [%bar%] %percent%%')

        output = self.get_output_stream()
        progress.start(output, 10)
        progress.advance()

        output.get_stream().seek(0)
        self.assertEqual(self.generate_output('  1/10 [_/        ]  10%'),
                         output.get_stream().read())