public void ProxyAndPort_DefaultsToUsernameNull()
{
var proxy = new ProxyManagerDouble("http://example.com:8080");
Assert.That(proxy.Hostname, Is.EqualTo("example.com"));
Assert.That(proxy.Port, Is.EqualTo(8080));
Assert.That(proxy.Username, Is.Null);
Assert.That(proxy.Password, Is.Null);
}