final List<MavenProject> subsequent = graph.markAsFinished( A );
assertEquals( 2, subsequent.size() );
assertEquals( ProjectDependencyGraphStub.B, subsequent.get( 0 ) );
assertEquals( C, subsequent.get( 1 ) );
final List<MavenProject> bDescendants = graph.markAsFinished( B );
assertEquals( 1, bDescendants.size() );
assertEquals( Y, bDescendants.get( 0 ) );
final List<MavenProject> cDescendants = graph.markAsFinished( C );
assertEquals( 2, cDescendants.size() );