It is possible that HW3 can also get stuck? not inheriting timeout correctly?

[tansaku]

Reviewing the code for the HW3 grader, it looks like it also doesn't inherit the @timeout instance variable correctly. I'm not aware of an instance of the HW3 grader getting stuck, but we should review the code; and at the very least add a test case for some other HW3 cases other than a perfect pass.

This seems lower priority, so perhaps this test should be set up with a new approach that avoids exposing the solutions as discussed here: #70