Seven assertions against a real store, the important one being that a
consumer cannot reach another consumer's bucket — isolation here is a
policy somebody wrote rather than a boundary the product has.
The revocation test stages its own precondition. The first version
asserted a key left by an earlier test, and the rotation test had
already revoked it two tests early: the behaviour was correct and the
test was measuring residue. Its precondition assertion is what caught
that, rather than it passing green having verified nothing.
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