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Taylor R Campbell authored
Test exactly what the geometric sampler returns, because that's what the downstream callers of it are going to use. While here, also assert that the geometric sampler returns a positive integer. (Our geometric distribution is the one suported on {1, 2, 3, ...} that returns the number of trials before the first success, not the one supported on {0, 1, 2, ...} that returns the number of failures before the first success.)
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