assertEquals(1, graph.getFinishedProjects().size());

        graph.markAsFinished(ProjectDependencyGraphStub.A);
        // still only  A
        assertEquals(1, graph.getFinishedProjects().size());

        Set<MavenProject> unfinishedProjects = graph.getUnfinishedProjects();
        assertEquals(5, unfinishedProjects.size());

        graph.markAsFinished(schedulableNewProcesses.get(0));

        ConcurrencyDependencyGraph graph =
                new ConcurrencyDependencyGraph(getProjectBuildList(session), dependencyGraph);

        graph.markAsFinished(A);
        final List<MavenProject> cDescendants = graph.markAsFinished(C);
        assertEquals(1, cDescendants.size());
        assertEquals(Z, cDescendants.get(0));

        final List<MavenProject> bDescendants = graph.markAsFinished(B);