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Unit tests for L{ConnectionPool}.
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If rollback fails, L{ConnectionPool.runWithConnection} raises the
original exception and log the error of the rollback.
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L{ConnectionPool._close} logs exceptions.
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If rollback fails, L{ConnectionPool.runInteraction} raises the
original exception and log the error of the rollback.
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If L{ConnectionPool.close} is called without L{ConnectionPool.start}
having been called, the pool's startup event is cancelled.
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If L{ConnectionPool.close} is called after it has been started, but
not by its shutdown trigger, the shutdown trigger is cancelled.
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