Added unittest infos

Author: martialblog

docs/Printers.md

@@ -2,26 +2,36 @@
 
 OK, so you want to add a new output format. Very good! Here's how you do it. 
 
-* Add the new command-line option to the printer group.
+Add the new command-line option to the printer group.
 
 ```python
 help_MyNewPrinter = "The most awesome printer to exist in the observable universe"
 printertype.add_argument('-x', help=help_MyNewPrinter, action='store_const', dest='printer', const='MyNewPrinter')
 ```
 
-* Create a new Printer subclass based on the name you just added. It should the implement the printsheet method.
+Create a new Printer subclass based on the name you just added. It should the implement the printsheet method.
 
 ```python
 class MyNewPrinter(Printer):
     [...]
 ```
 
 
-* Add the new Printer type to the PrinterFactory, so the new Printer object can be instantiated.
+Add the new Printer type to the PrinterFactory, so the new Printer object can be instantiated.
 
 ```python
 printer_classes = {
     [...]
     "MyNewPrinter": MyNewPrinter,
     }
 ```
+
+Extend the unittest to include the new Printer type
+
+```python
+def test_PrinterFactory_MyNewPrinter(self):
+    self.assertIs(
+    cp.PrinterFactory.create_printer("MyNewPrinterPrinter"),
+    cp.MyNewPrinter
+    )
+```