test_clf_transport.py 文件源码

def test_read(self, serial, tty):
        serial.return_value.read.side_effect = [
            HEX('0000ff00ff00'),
        ]
        assert tty.read(0) == b'\x00\x00\xff\x00\xff\x00'
        assert serial.return_value.read.mock_calls == [call(6)]
        assert tty.tty.timeout == 0.05

        serial.return_value.read.reset_mock()
        serial.return_value.read.side_effect = [
            HEX('0000ff03fbd5'), HEX('01020000'),
        ]
        assert tty.read(51) == b'\x00\x00\xff\x03\xfb\xd5\x01\x02\x00\x00'
        assert serial.return_value.read.mock_calls == [call(6), call(4)]
        assert tty.tty.timeout == 0.051

        serial.return_value.read.reset_mock()
        serial.return_value.read.side_effect = [
            HEX('0000ffffff01'), HEX('01fed5'), bytearray(256) + HEX('2b00'),
        ]
        tty.read(100)
        assert serial.return_value.read.mock_calls == [
            call(6), call(3), call(258),
        ]
        assert tty.tty.timeout == 0.1

        serial.return_value.read.reset_mock()
        serial.return_value.read.side_effect = [HEX('')]
        with pytest.raises(IOError) as excinfo:
            tty.read(1100)
        assert excinfo.value.errno == errno.ETIMEDOUT
        assert serial.return_value.read.mock_calls == [call(6)]
        assert tty.tty.timeout == 1.1

        tty.tty = None
        assert tty.read(1000) is None