test_i2c.py 文件源码

def test_i2c_command_device_not_found_error():
    errorbus = Mock(unsafe=True)
    address = 0x71
    cmds = [3, 1, 4, 2]
    expected_error = OSError()

    try:
        for error_code in [errno.EREMOTEIO, errno.EIO]:
            expected_error.errno = error_code
            errorbus.write_i2c_block_data.side_effect = expected_error

            serial = i2c(bus=errorbus, address=address)
            with pytest.raises(luma.core.error.DeviceNotFoundError) as ex:
                serial.command(*cmds)

            assert str(ex.value) == 'I2C device not found on address: 0x{0:02X}'.format(
                address)
    except AttributeError as e:
        # osx
        pytest.skip(str(e))