tests/basics: Add test for set.difference_update with arg being itself.

2016-09-28 11:10:27 +10:00 · 2016-09-28 11:10:27 +10:00 · 443cc0114d
commit 443cc0114d
--- a/tests/basics/set_difference.py
+++ b/tests/basics/set_difference.py
@ -14,3 +14,6 @@ print(s.difference_update({1}))
 print(sorted(s))
 print(s.difference_update({1}, [2]))
 print(sorted(s))
+
+s.difference_update(s)
+print(s)