public void EnsuresNonNullArguments()
            {
                var client = new ObservableRepositoryTrafficClient(Substitute.For<IGitHubClient>());

                Assert.Throws<ArgumentNullException>(() => client.GetReferrers(null, "name"));
                Assert.Throws<ArgumentNullException>(() => client.GetReferrers("owner", null));

                Assert.Throws<ArgumentException>(() => client.GetReferrers("", "name"));
                Assert.Throws<ArgumentException>(() => client.GetReferrers("owner", ""));
            }
            public void RequestsCorrectUrlWithRepositoryId()
            {
                var gitHubClient = Substitute.For<IGitHubClient>();
                var client = new ObservableRepositoryTrafficClient(gitHubClient);

                client.GetReferrers(1);

                gitHubClient.Received().Repository.Traffic.GetReferrers(1);
            }