public async Task ShouldStopSendingHeartbeatsToTheTxWorker(
uint interval,
int sequenceNumber,
[Frozen] ITimer heartbeat,
[Frozen, Substitute] IGatewayUtilsFactory factory,
[Frozen, Substitute] IGatewayTxWorker txWorker,
[Frozen, Substitute] ITimerFactory timerFactory,
[Target] DefaultGatewayService gateway
)
{
gateway.SequenceNumber = sequenceNumber;
await gateway.StartAsync();
await gateway.StartHeartbeat(interval);
await gateway.StopHeartbeat();
await heartbeat.Received().Stop();
}