public void FakeProviderTest()
        {
            var retriever = new VpnAddressRetriever(new FakeVpnAddressProviderFactory());
            var newestIpAddress = retriever.GetVpnAddress();

            Assert.AreEqual(newestIpAddress, TestingHelper.FakeVpnAddress);
        }
        public void DefaultProviderTest()
        {
            var retriever = new VpnAddressRetriever();
            var newestIpAddress = retriever.GetVpnAddress();

            Assert.AreEqual(newestIpAddress, TestingHelper.VpnTestAddressOnGitHub);
        }