public async Task RequestsCorrectUrl()
            {
                var gitHubClient = Substitute.For<IGitHubClient>();
                var client = new ObservableCommitsClient(gitHubClient);

                client.Get("owner", "name", "reference");

                gitHubClient.Git.Commit.Received(1).Get("owner", "name", "reference");
            }
            public async Task RequestsCorrectUrlWithRepositoryId()
            {
                var gitHubClient = Substitute.For<IGitHubClient>();
                var client = new ObservableCommitsClient(gitHubClient);

                client.Get(1, "reference");

                gitHubClient.Git.Commit.Received(1).Get(1, "reference");
            }
            public async Task RequestsCorrectUrl()
            {
                var gitHubClient = Substitute.For<IGitHubClient>();
                var client = new ObservableCommitsClient(gitHubClient);
                var newCommit = new NewCommit("message", "tree", new[] { "parent1", "parent2" });

                client.Create("owner", "name", newCommit);

                gitHubClient.Git.Commit.Received().Create("owner", "name", newCommit);
            }
            public async Task RequestsCorrectUrl()
            {
                var gitHubClient = Substitute.For<IGitHubClient>();
                var client = new ObservableCommitsClient(gitHubClient);

                client.Get("owner", "name", "reference");

                gitHubClient.Connection.GetAsync<IReadOnlyList<GitHubClient>>(
                    new Uri("repos/owner/name/commits/reference", UriKind.Relative), null, null);
            }
            public async Task EnsureNonNullArguments()
            {
                var client = new ObservableCommitsClient(Substitute.For<IGitHubClient>());
                var newCommit = new NewCommit("message", "tree", new[] { "parent1", "parent2" });

                await Assert.ThrowsAsync<ArgumentNullException>(() => client.Create(null, "name", newCommit).ToTask());
                await Assert.ThrowsAsync<ArgumentNullException>(() => client.Create("owner", null, newCommit).ToTask());
                await Assert.ThrowsAsync<ArgumentNullException>(() => client.Create("owner", "name", null).ToTask());
                await Assert.ThrowsAsync<ArgumentException>(() => client.Create("", "name", newCommit).ToTask());
                await Assert.ThrowsAsync<ArgumentException>(() => client.Create("owner", "", newCommit).ToTask());
            }
            public async Task EnsureNonNullArguments()
            {
                var client = new ObservableCommitsClient(Substitute.For<IGitHubClient>());

                await Assert.ThrowsAsync<ArgumentNullException>(() => client.Get(null, "name", "").ToTask());
                await Assert.ThrowsAsync<ArgumentNullException>(() => client.Get("owner", null, "").ToTask());
                await Assert.ThrowsAsync<ArgumentNullException>(() => client.Get("owner", "name", null).ToTask());
                await Assert.ThrowsAsync<ArgumentException>(() => client.Get("", "name", "reference").ToTask());
                await Assert.ThrowsAsync<ArgumentException>(() => client.Get("owner", "", "reference").ToTask());
                await Assert.ThrowsAsync<ArgumentException>(() => client.Get("owner", "name", "").ToTask());
            }
            public async Task PostsToTheCorrectUrlWithRepositoryId()
            {
                var gitHubClient = Substitute.For<IGitHubClient>();
                var client = new ObservableCommitsClient(gitHubClient);

                var newCommit = new NewCommit("message", "tree", new[] { "parent1", "parent2" });

                client.Create(1, newCommit);

                gitHubClient.Git.Commit.Received().Create(1, newCommit);
            }
            public void EnsureNonNullArguments()
            {
                var client = new ObservableCommitsClient(Substitute.For<IGitHubClient>());

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

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

                Assert.Throws<ArgumentException>(() => client.Get("", "name", "reference"));
                Assert.Throws<ArgumentException>(() => client.Get("owner", "", "reference"));
                Assert.Throws<ArgumentException>(() => client.Get("owner", "name", ""));

                Assert.Throws<ArgumentException>(() => client.Get(1, ""));
            }