public async Task IterationSetup()
{
var chain = await _blockchainService.GetChainAsync();
var tokenAmount = TransactionCount / GroupCount;
(_prepareTransactions, _keyPairs) = await _osTestHelper.PrepareTokenForParallel(GroupCount, tokenAmount);
_block = _osTestHelper.GenerateBlock(chain.BestChainHash, chain.BestChainHeight, _prepareTransactions);
await _blockExecutingService.ExecuteBlockAsync(_block.Header, _prepareTransactions);
await _osTestHelper.BroadcastTransactions(_prepareTransactions);
_block = (await _minerService.MineAsync(chain.BestChainHash, chain.BestChainHeight,
TimestampHelper.GetUtcNow(), TimestampHelper.DurationFromSeconds(4))).Block;
_systemTransactions = await _osTestHelper.GenerateTransferTransactions(1);
_cancellableTransactions = await _osTestHelper.GenerateTransactionsWithoutConflictAsync(_keyPairs, tokenAmount);
chain = await _blockchainService.GetChainAsync();
_block = _osTestHelper.GenerateBlock(chain.BestChainHash, chain.BestChainHeight,
_systemTransactions.Concat(_cancellableTransactions));
}