test_clf_transport.py 文件源码

def test_read(self, usb):
        usb.usb_dev.bulkRead.side_effect = [
            b'12',
            b'34',
            nfc.clf.transport.libusb.USBErrorTimeout,
            nfc.clf.transport.libusb.USBErrorNoDevice,
            nfc.clf.transport.libusb.USBError,
            b'',
        ]
        assert usb.read() == b'12'
        usb.usb_dev.bulkRead.assert_called_with(0x84, 300, 0)

        assert usb.read(100) == b'34'
        usb.usb_dev.bulkRead.assert_called_with(0x84, 300, 100)

        with pytest.raises(IOError) as excinfo:
            usb.read()
        assert excinfo.value.errno == errno.ETIMEDOUT

        with pytest.raises(IOError) as excinfo:
            usb.read()
        assert excinfo.value.errno == errno.ENODEV

        with pytest.raises(IOError) as excinfo:
            usb.read()
        assert excinfo.value.errno == errno.EIO

        with pytest.raises(IOError) as excinfo:
            usb.read()
        assert excinfo.value.errno == errno.EIO

        usb.usb_inp = None
        assert usb.read() is None