Randomness plays a role in the t/test_classes.t test of App-SimulateReads-0.16

[andk]

Cpantesters at the moment has three fail reports that look very similar:

http://www.cpantesters.org/cpan/report/ac26ae6a-62d8-11eb-a7b1-5e721f24ea8f
http://www.cpantesters.org/cpan/report/2e789072-a7c5-11ec-9d95-7f323e235ef0
http://www.cpantesters.org/cpan/report/1c563258-a835-11ec-bf1f-3d4ddc81be55

I produced the last one by simply letting the test run repeatedly in a loop for a while. It took maybe 200-300 iterations until the fail happened.