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

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

                Assert.Throws<ArgumentNullException>(() => client.Create(1, null));

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

                var newRepositoryFork = new NewRepositoryFork();

                client.Create(1, newRepositoryFork);

                gitHubClient.Received().Repository.Forks.Create(1, newRepositoryFork);
            }