to_ical API also for ContentLines

src/icalendar/cal.py

@@ -418,7 +418,7 @@ class Component(CaselessDict):
 
 
     def to_ical(self):
-        return str(self.content_lines())
+        return self.content_lines().to_ical()
 
 
 

src/icalendar/parser.py

@@ -286,7 +286,7 @@ class Contentline(str):
     '123456789 123456789 123456789 123456789 123456789 123456789 123456789 1234\\r\\n 56789 123456789 123456789'
 
     A folded line gets unfolded
-    >>> c = Contentline.from_ical(str(c))
+    >>> c = Contentline.from_ical(c.to_ical())
     >>> c
     '123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789'