def METHOD_NAME(self):
    self.conv.unit = 'B'
    x = self.conv(10e3)
    for _ in range(5):
        x = self.conv(x)
        self.assertEqual(x.with_unit, '10kB')
    self.conv.unit = 'b'
    x = self.conv(10e3)
    for _ in range(5):
        x = self.conv(x)
        self.assertEqual(x.with_unit, '10kb')