Add test_printer_serial.py

test/test_printers/test_printer_serial.py

@@ -0,0 +1,96 @@
+#!/usr/bin/python
+#  -*- coding: utf-8 -*-
+"""tests for the Serial printer
+
+:author: Benito López and the python-escpos developers
+:organization: `python-escpos <https://github.com/python-escpos>`_
+:copyright: Copyright (c) 2023 `python-escpos <https://github.com/python-escpos>`_
+:license: MIT
+"""
+
+import logging
+
+import pytest
+
+
+def test_device_not_initialized(serialprinter):
+    """
+    GIVEN a serial printer object
+    WHEN it is not initialized
+    THEN check the device property is False
+    """
+    assert serialprinter._device is False
+
+
+def test_open_raise_exception(serialprinter, devicenotfounderror):
+    """
+    GIVEN a serial printer object
+    WHEN open() is set to raise a DeviceNotFoundError on error
+    THEN check the exception is raised
+    """
+    serialprinter.devfile = "fake/device"
+
+    with pytest.raises(devicenotfounderror):
+        serialprinter.open(raise_not_found=True)
+
+
+def test_open_not_raise_exception(serialprinter, caplog):
+    """
+    GIVEN a serial printer object
+    WHEN open() is set to not raise on error but simply cancel
+    THEN check the error is logged and open() canceled
+    """
+    serialprinter.devfile = "fake/device"
+
+    with caplog.at_level(logging.ERROR):
+        serialprinter.open(raise_not_found=False)
+
+    assert "not found" in caplog.text
+    assert serialprinter.device is None
+
+
+def test_open(serialprinter, caplog, mocker):
+    """
+    GIVEN a serial printer object and a mocked pyserial device
+    WHEN a valid connection to a device is opened
+    THEN check the success is logged and the device property is set
+    """
+    mocker.patch("serial.Serial")
+
+    with caplog.at_level(logging.INFO):
+        serialprinter.open()
+
+    assert "enabled" in caplog.text
+    assert serialprinter.device
+
+
+def test_close_on_reopen(serialprinter, mocker):
+    """
+    GIVEN a serial printer object and a mocked connection
+    WHEN a valid connection to a device is reopened before close
+    THEN check the close method is called if _device
+    """
+    mocker.patch("serial.Serial")
+    spy = mocker.spy(serialprinter, "close")
+
+    serialprinter.open()
+    assert serialprinter._device
+
+    serialprinter.open()
+    spy.assert_called_once_with()
+
+
+def test_close(serialprinter, caplog, mocker):
+    """
+    GIVEN a serial printer object and a mocked pyserial device
+    WHEN a connection is opened and closed
+    THEN check the closing is logged and the device property is False
+    """
+    mocker.patch("serial.Serial")
+    serialprinter.open()
+
+    with caplog.at_level(logging.INFO):
+        serialprinter.close()
+
+    assert "Closing" in caplog.text
+    assert serialprinter._device is False