Adds tests to ensure that tires are unique.
Adds tests to ensure that tires are unique.

is210-faculty/is210-week-11-warmup,is210-2015-fall-01/is210-week-11-warmup,is210-faculty/is210-week-11-warmup,is210-2015-fall-01/is210-week-11-warmup,is210-2015-fall-02/is210-week-11-warmup,is210-2015-fall-02/is210-week-11-warmup