Unit tests for a function that calculates demerit points for speeding
You probably want to 


add a constant for speed 0
create a test for MaxSpeed
create a test case for 64 (it's one edge of the partition class  0 &lt;= x &lt; speedlimit and it could replace 60 which is in the same partition class)


I would keep the 66 test case since it is and edge case.

Even though the edges are cut pretty clear with ints (compared to using float values) you might still want to test them explicitly.