GenRandomBytes returns generated random bytes array, with specified length.

GetNextPortAvailable check if port is available and return it.

Keccak256 is function used in testing only, it has the dedicated implementation for purpose of double-check result.

RandomPositiveInt64 returns a random int64, value >= 0.

StartTendermintNode starts a Tendermint node for the given ABCI Application, used for testing purposes.