public void Equals_should_return_true(NameServer ns2, bool expectedResult)
{
// Arrange.
const string ipAddress = "10.1.1.10";
const int port = 53;
NameServer ns = new NameServer(IPAddress.Parse(ipAddress));
// Act.
bool result = ns.Equals(ns2);
// Assert.
Assert.AreEqual(expectedResult, result);
}