Greg Spencer 19722fb96c
Clean up dismissable_test to be less fragile (#89870)
This cleans up the dismissable_test to be less fragile, and make it harder to forget to reset things between runs.

I eliminated a bunch of globals that were susceptible to being missed and passed them in to buildTest instead, and removed some values that were always the same (itemExtent).
2021-09-20 09:07:28 -07:00
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