public void TestCloseIssue()
        {
            var dlg = Factory.Get <IAddComment>();
            var api = Factory.Get <GitHubApiBase>();

            api.Issue.State   = ItemState.Open;
            api.IssueMarkdown = "Issue body";

            _gitHubViewModel.Comment = "TestCommentOnIssue";
            _gitHubViewModel.OnCloseIssue(dlg);

            Assert.That(api.Issue.State, Is.EqualTo(ItemState.Closed));
            Assert.That(api.IssueMarkdown, Contains.Substring("TestCommentOnIssue"));
        }