public DiscoveryTestBuilder WithDns(IDns dnsClient = default,
bool mock = false,
IPeerSettings peerSettings = default)
{
_dnsClient = dnsClient == default(IDns) && mock == false
? Substitute.For <IDns>()
: DiscoveryHelper.MockDnsClient(_peerSettings = _peerSettings == null && peerSettings == default(IPeerSettings)
? PeerSettingsHelper.TestPeerSettings()
: peerSettings);
return(this);
}