public async Task EnsuresNonNullArguments()
        {
            var client = new CommitsClient(Substitute.For <IApiConnection>());

            var newCommit = new NewCommit("message", "tree", new[] { "parent1", "parent2" });
            await Assert.ThrowsAsync <ArgumentNullException>(() => client.Create(null, "name", newCommit));

            await Assert.ThrowsAsync <ArgumentNullException>(() => client.Create("owner", null, newCommit));

            await Assert.ThrowsAsync <ArgumentNullException>(() => client.Create("owner", "name", null));

            await Assert.ThrowsAsync <ArgumentException>(() => client.Create("", "name", newCommit));

            await Assert.ThrowsAsync <ArgumentException>(() => client.Create("owner", "", newCommit));
        }
        public void PostsToTheCorrectUrlWithRepositoryId()
        {
            var connection = Substitute.For <IApiConnection>();
            var client     = new CommitsClient(connection);

            var parents = new List <string> {
                "sha-reference1", "sha-reference2"
            };
            var newCommit = new NewCommit("message", "tree", parents);

            client.Create(1, newCommit);

            connection.Received().Post <Commit>(Arg.Is <Uri>(u => u.ToString() == "repositories/1/git/commits"),
                                                Arg.Is <NewCommit>(nc => nc.Message == "message" &&
                                                                   nc.Tree == "tree" &&
                                                                   nc.Parents.Count() == 2));
        }