No need to cover the Python 3.2 case.

topydo/lib/IcalPrinter.py

@@ -69,7 +69,7 @@ class IcalPrinter(Printer):
         try:
             import icalendar
             self.icalendar = icalendar
-        except (SyntaxError, ImportError):
+        except (SyntaxError, ImportError): # pragma: no cover
             # icalendar does not support Python 3.2 resulting in a SyntaxError. Since
             # this is an optional dependency, dropping Python 3.2 support altogether is
             # too much. Therefore just disable the iCalendar functionality