Function test_io 

pub fn test_io<A, S, Q>(instance: &mut Instance<A, S, Q>)
where
    A: BackendApi + 'static,
    S: Storage + 'static,
    Q: Querier + 'static,

Runs a series of IO tests, hammering especially on allocate and deallocate. This could be especially useful when run with some kind of leak detector.