public async Task EnsuresArgumentsNotNull()
        {
            var connection = Substitute.For<IApiConnection>();
            var client = new PullRequestReviewCommentsClient(connection);

            string body = "Comment content";
            string commitId = "qe3dsdsf6";
            string path = "file.css";
            int position = 7;

            var comment = new PullRequestReviewCommentCreate(body, commitId, path, position);

            await Assert.ThrowsAsync<ArgumentNullException>(() => client.Create(null, "fakeRepoName", 1, comment));
            await Assert.ThrowsAsync<ArgumentException>(() => client.Create("", "fakeRepoName", 1, comment));
            await Assert.ThrowsAsync<ArgumentNullException>(() => client.Create("fakeOwner", null, 1, comment));
            await Assert.ThrowsAsync<ArgumentException>(() => client.Create("fakeOwner", "", 1, comment));
            await Assert.ThrowsAsync<ArgumentNullException>(() => client.Create("fakeOwner", "fakeRepoName", 1, null));
        }
        public void PostsToCorrectUrl()
        {
            var connection = Substitute.For<IApiConnection>();
            var client = new PullRequestReviewCommentsClient(connection);

            var comment = new PullRequestReviewCommentCreate("Comment content", "qe3dsdsf6", "file.css", 7);

            client.Create("fakeOwner", "fakeRepoName", 13, comment);

            connection.Connection.Received().Post<PullRequestReviewComment>(Arg.Is<Uri>(u => u.ToString() == "repos/fakeOwner/fakeRepoName/pulls/13/comments"),
                comment, null, null);
        }