Add a TODO

Author: sebastinas

tests/test_fmtstr.py

@@ -558,6 +558,7 @@ def test_no_hanging_space(self):
     def test_assignment_working(self):
         t = FSArray(10, 10)
         t[2, 2] = "a"
+        # TODO: is this supposed to check something?
         t[2, 2] == "a"
 
     def test_normalize_slice(self):