public void CallsIntoClient()
            {
                var github = Substitute.For <IGitHubClient>();
                var client = new ObservableEnterpriseSearchIndexingClient(github);

                client.QueueAllIssues("org");
                github.Enterprise.SearchIndexing.Received(1).
                QueueAllIssues(Arg.Is <string>("org"));

                client.QueueAllIssues("org", "repo");
                github.Enterprise.SearchIndexing.Received(1).
                QueueAllIssues(Arg.Is <string>("org"),
                               Arg.Is <string>("repo"));
            }