public void GetIPWhenValidHostShouldReturnFirstValidAddressFromAdressList()
{
DNSClientSide dnsClient = new DNSClientSide();
string hostIP = dnsClient.GetIP("www.google.com");
Assert.True(IPAddress.TryParse(hostIP, out IPAddress address));
}
public void GetIPWhenHostIsIPShouldReturnSameIP()
{
DNSClientSide dnsClient = new DNSClientSide();
string hostIP = dnsClient.GetIP("78.96.7.88");
Assert.True(IPAddress.TryParse(hostIP, out IPAddress address));
Assert.Equal("78.96.7.88", hostIP);
}
public void GetIPWhenEmptyStringShouldReturnFirstValidAddressFromHostRunningClient()
{
DNSClientSide dnsClient = new DNSClientSide();
string hostIP = dnsClient.GetIP("");
Assert.True(IPAddress.TryParse(hostIP, out IPAddress address));
Assert.Contains <IPAddress>(address, Dns.GetHostAddresses(Dns.GetHostName()));
}
public void GetIPWhenHostLengthIsGreaterThan255CharactersShouldThrowException()
{
DNSClientSide dnsClient = new DNSClientSide();
string hostName = "www.t";
for (int i = 0; i < 255; i++)
{
hostName += "o";
}
hostName += ".long";
Assert.Throws <ArgumentOutOfRangeException>(() => dnsClient.GetIP(hostName));
}
public void GetIPWhenNullStringShouldThrowException()
{
DNSClientSide dnsClient = new DNSClientSide();
Assert.Throws <ArgumentNullException>(() => dnsClient.GetIP(null));
}
public void GetIPWhenNotResolvingHostShouldThrowException()
{
DNSClientSide dnsClient = new DNSClientSide();
Assert.Throws <SocketException>(() => dnsClient.GetIP("invalidIPaddress"));
}
public void GetIPWhenHostIsInvalidIPShouldThrowException()
{
DNSClientSide dnsClient = new DNSClientSide();
Assert.Throws <ArgumentException>(() => dnsClient.GetIP("0.0.0.0"));
}