def test_update_should_return_false_if_update_not_successfull(self, mock_chmod, mock_stat, mock_isfile, mock_Popen):
mock_isfile.return_value = True
mock_Popen.return_value.communicate.return_value = ('err', 'out')
mock_Popen.return_value.wait.return_value = 34
usb_addess = '{}:{}'.format('0483', 'df11')
expected_command = [os.path.join(self.bin_path, 'dfu-util'), '-a', '0', '--dfuse-address', '0x08000000', '-D', self.firmware_path, '-d', usb_addess]
l_fw_up = LinuxFirmwareUpdater(self.bin_path, self.BOOTLOADER_IDVENDOR, self.BOOTLOADER_IDPRODUCT, self.PEACHY_IDVENDOR, self.PEACHY_IDPRODUCT)
result = l_fw_up.update(self.firmware_path)
self.assertFalse(result)
mock_Popen.assert_called_with(expected_command, stdout=PIPE, stderr=PIPE)
mock_Popen.return_value.wait.assert_called_with()
