public async Task BeforeAll()
{
_batchExceptionEvents = new ConcurrentBag <Tuple <object, BatchExceptionEventArguments> >();
_setup = new ChainBatcherTestSetup();
_setup.ThrowWhenSquaring(ThrowWhenSquaring);
_setup.ThrowWhenConvertingToString(ThrowWhenConvertingToString);
_setup.ThrowWhenPuttingInResultsBag(ThrowWhenPuttingInResultsBag);
_batcher = _setup.GetBatcher(_synchronicity);
_batcher.ExceptionEvent += (o, e) => _batchExceptionEvents.Add(Tuple.Create(o, e));
_batcher.Process(_setup.StartItems);
await _batcher.WaitUntilDone();
}
