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

                Assert.Throws<ArgumentNullException>(() => client.GetLatest(null, "name"));
                Assert.Throws<ArgumentNullException>(() => client.GetLatest("owner", null));
            }
            public void RequestsCorrectUrlWithRepositoryId()
            {
                var gitHubClient = Substitute.For<IGitHubClient>();
                var client = new ObservableRepositoryPagesClient(gitHubClient);

                client.GetLatest(1);

                gitHubClient.Received().Repository.Page.GetLatest(1);
            }