Separate method open() and constructor, enhance consistency between connectors: Rework printer tests (#587)

* Add fixtures
* Add test_printer_file.py
* Remove old broken printer tests
* Include a close_on_reopen test
* Add test_printer_network.py
* Add test_printer_serial.py
* Add test_printer_usb.py
* Add test_printer_lp.py
* Add test_printer_cups.py
* Add test_printer_win32raw.py
* Test the 'printers' property
* Fix conftest import formatting
* Fix failing LP tests
* Cancel close only if literal False|None _device
* Fix win32raw failing tests (maybe)
* Include win32raw close_on_reopen test
* Include test _raw methods to win32raw
* Replace general exceptions in win32raw
* Replace wrong exception in cups
* Include more tests to cups
* Extend cups tests

src/escpos/printer/cups.py

@@ -172,9 +172,9 @@ class CupsPrinter(Escpos):
         self.pending_job = True
         try:
             self.tmpfile.write(msg)
-        except ValueError:
+        except TypeError:
             self.pending_job = False
-            raise ValueError("Printer job not opened")
+            raise TypeError("Bytes required. Printer job not opened")
 
     def send(self):
         """Send the print job to the printer."""

src/escpos/printer/win32raw.py

@@ -138,7 +138,7 @@ class Win32Raw(Escpos):
 
     def close(self) -> None:
         """Close connection to default printer."""
-        if not self._device:
+        if self._device is False or self._device is None:  # Literal False | None
             return
         logging.info("Closing Win32Raw connection to printer %s", self.printer_name)
         win32print.EndPagePrinter(self._device)
@@ -153,7 +153,7 @@ class Win32Raw(Escpos):
         :type msg: bytes
         """
         if self.printer_name is None:
-            raise Exception("Printer not found")
+            raise DeviceNotFoundError("Printer not found")
         if not self.device:
-            raise Exception("Printer job not opened")
+            raise DeviceNotFoundError("Printer job not opened")
         win32print.WritePrinter(self.device, msg)